61557163626 has 16 divisors (see below), whose sum is σ = 140702088384. Its totient is φ = 17587761024.

The previous prime is 61557163621. The next prime is 61557163627. The reversal of 61557163626 is 62636175516.

It is not an unprimeable number, because it can be changed into a prime (61557163621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 732823335 + ... + 732823418.

It is an arithmetic number, because the mean of its divisors is an integer number (8793880524).

Almost surely, 2^61557163626 is an apocalyptic number.

61557163626 is an abundant number, since it is smaller than the sum of its proper divisors (79144924758).

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

61557163626 is a wasteful number, since it uses less digits than its factorization.

61557163626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1465646765.

The product of its digits is 1360800, while the sum is 48.

The spelling of 61557163626 in words is "sixty-one billion, five hundred fifty-seven million, one hundred sixty-three thousand, six hundred twenty-six".