61142037561 has 24 divisors (see below), whose sum is σ = 96401279520. Its totient is φ = 37034145600.

The previous prime is 61142037559. The next prime is 61142037571. The reversal of 61142037561 is 16573024116.

61142037561 is a `hidden beast` number, since 61 + 1 + 4 + 2 + 0 + 37 + 561 = 666.

It is not a de Polignac number, because 61142037561 - 2¹ = 61142037559 is a prime.

It is a super-2 number, since 2×61142037561² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61142037571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9051 + ... + 349808.

It is an arithmetic number, because the mean of its divisors is an integer number (4016719980).

Almost surely, 2^61142037561 is an apocalyptic number.

It is an amenable number.

61142037561 is a deficient number, since it is larger than the sum of its proper divisors (35259241959).

61142037561 is a wasteful number, since it uses less digits than its factorization.

61142037561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360597 (or 360594 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The spelling of 61142037561 in words is "sixty-one billion, one hundred forty-two million, thirty-seven thousand, five hundred sixty-one".