61601015631 has 8 divisors (see below), whose sum is σ = 82282148784. Its totient is φ = 40993613120.

The previous prime is 61601015599. The next prime is 61601015633. The reversal of 61601015631 is 13651010616.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61601015631 - 2⁵ = 61601015599 is a prime.

It is a super-2 number, since 2×61601015631² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61601015633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18430710 + ... + 18434051.

It is an arithmetic number, because the mean of its divisors is an integer number (10285268598).

Almost surely, 2^61601015631 is an apocalyptic number.

61601015631 is a deficient number, since it is larger than the sum of its proper divisors (20681133153).

61601015631 is a wasteful number, since it uses less digits than its factorization.

61601015631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36865321.

The product of its (nonzero) digits is 3240, while the sum is 30.

The spelling of 61601015631 in words is "sixty-one billion, six hundred one million, fifteen thousand, six hundred thirty-one".