61000005591 has 24 divisors (see below), whose sum is σ = 106621860384. Its totient is φ = 32806725120.

The previous prime is 61000005559. The next prime is 61000005607. The reversal of 61000005591 is 19550000016.

61000005591 is a `hidden beast` number, since 6 + 100 + 0 + 0 + 0 + 559 + 1 = 666.

It is not a de Polignac number, because 61000005591 - 2⁵ = 61000005559 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61000005491) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28476990 + ... + 28479131.

It is an arithmetic number, because the mean of its divisors is an integer number (4442577516).

Almost surely, 2^61000005591 is an apocalyptic number.

61000005591 is a deficient number, since it is larger than the sum of its proper divisors (45621854793).

61000005591 is a wasteful number, since it uses less digits than its factorization.

61000005591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56956151 (or 56956148 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 27.

The spelling of 61000005591 in words is "sixty-one billion, five thousand, five hundred ninety-one".