61651251665712 has 120 divisors (see below), whose sum is σ = 185045589471600. Its totient is φ = 19101480113664.

The previous prime is 61651251665671. The next prime is 61651251665719. The reversal of 61651251665712 is 21756615215616.

It is a happy number.

61651251665712 is a `hidden beast` number, since 6 + 1 + 6 + 5 + 1 + 2 + 5 + 1 + 66 + 571 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (61651251665719) 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, 212433787 + ... + 212723802.

It is an arithmetic number, because the mean of its divisors is an integer number (1542046578930).

Almost surely, 2^{61651251665712} is an apocalyptic number.

It is an amenable number.

61651251665712 is an abundant number, since it is smaller than the sum of its proper divisors (123394337805888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61651251665712 is a wasteful number, since it uses less digits than its factorization.

61651251665712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425157675 (or 425157666 counting only the distinct ones).

The product of its digits is 4536000, while the sum is 54.

The spelling of 61651251665712 in words is "sixty-one trillion, six hundred fifty-one billion, two hundred fifty-one million, six hundred sixty-five thousand, seven hundred twelve".