61331426568 has 24 divisors (see below), whose sum is σ = 166105947150. Its totient is φ = 20443808832.

The previous prime is 61331426557. The next prime is 61331426587. The reversal of 61331426568 is 86562413316.

61331426568 is a `hidden beast` number, since 6 + 13 + 31 + 42 + 6 + 568 = 666.

It can be written as a sum of positive squares in only one way, i.e., 61039631844 + 291794724 = 247062^2 + 17082^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 425912613 + ... + 425912756.

Almost surely, 2^61331426568 is an apocalyptic number.

It is an amenable number.

61331426568 is an abundant number, since it is smaller than the sum of its proper divisors (104774520582).

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

61331426568 is a wasteful number, since it uses less digits than its factorization.

61331426568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851825381 (or 851825374 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The spelling of 61331426568 in words is "sixty-one billion, three hundred thirty-one million, four hundred twenty-six thousand, five hundred sixty-eight".