61568161631 has 8 divisors (see below), whose sum is σ = 62755385904. Its totient is φ = 60381884160.

The previous prime is 61568161619. The next prime is 61568161637. The reversal of 61568161631 is 13616186516.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61568161631 is a prime.

It is a super-2 number, since 2×61568161631² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61568161637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104690 + ... + 366191.

It is an arithmetic number, because the mean of its divisors is an integer number (7844423238).

Almost surely, 2^61568161631 is an apocalyptic number.

61568161631 is a deficient number, since it is larger than the sum of its proper divisors (1187224273).

61568161631 is a wasteful number, since it uses less digits than its factorization.

61568161631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473401.

The product of its digits is 155520, while the sum is 44.

The spelling of 61568161631 in words is "sixty-one billion, five hundred sixty-eight million, one hundred sixty-one thousand, six hundred thirty-one".