61651515762891 has 6 divisors (see below), whose sum is σ = 89052189435300. Its totient is φ = 41101010508588.

The previous prime is 61651515762829. The next prime is 61651515762979. The reversal of 61651515762891 is 19826751515616.

61651515762891 is a `hidden beast` number, since 6 + 1 + 6 + 5 + 1 + 51 + 576 + 2 + 8 + 9 + 1 = 666.

It is not a de Polignac number, because 61651515762891 - 2¹⁹ = 61651515238603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61651515762491) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3425084209041 + ... + 3425084209058.

It is an arithmetic number, because the mean of its divisors is an integer number (14842031572550).

Almost surely, 2^{61651515762891} is an apocalyptic number.

61651515762891 is a deficient number, since it is larger than the sum of its proper divisors (27400673672409).

61651515762891 is a wasteful number, since it uses less digits than its factorization.

61651515762891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6850168418105 (or 6850168418102 counting only the distinct ones).

The product of its digits is 27216000, while the sum is 63.

The spelling of 61651515762891 in words is "sixty-one trillion, six hundred fifty-one billion, five hundred fifteen million, seven hundred sixty-two thousand, eight hundred ninety-one".