61399652989 has 4 divisors (see below), whose sum is σ = 61400769760. Its totient is φ = 61398536220.

The previous prime is 61399652957. The next prime is 61399653037. The reversal of 61399652989 is 98925699316.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61399652989 - 2⁵ = 61399652957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61399652929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 471399 + ... + 587380.

It is an arithmetic number, because the mean of its divisors is an integer number (15350192440).

Almost surely, 2^61399652989 is an apocalyptic number.

It is an amenable number.

61399652989 is a deficient number, since it is larger than the sum of its proper divisors (1116771).

61399652989 is a wasteful number, since it uses less digits than its factorization.

61399652989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116770.

The product of its digits is 56687040, while the sum is 67.

The spelling of 61399652989 in words is "sixty-one billion, three hundred ninety-nine million, six hundred fifty-two thousand, nine hundred eighty-nine".