661654770031 has 16 divisors (see below), whose sum is σ = 693624895488. Its totient is φ = 629954820000.

The previous prime is 661654770017. The next prime is 661654770041. The reversal of 661654770031 is 130077456166.

661654770031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 661654770031 - 2⁵ = 661654769999 is a prime.

It is a super-2 number, since 2×661654770031² (a number of 24 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 (661654770041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9009721 + ... + 9082861.

It is an arithmetic number, because the mean of its divisors is an integer number (43351555968).

Almost surely, 2^661654770031 is an apocalyptic number.

661654770031 is a deficient number, since it is larger than the sum of its proper divisors (31970125457).

661654770031 is a wasteful number, since it uses less digits than its factorization.

661654770031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74982.

The product of its (nonzero) digits is 635040, while the sum is 46.

The spelling of 661654770031 in words is "six hundred sixty-one billion, six hundred fifty-four million, seven hundred seventy thousand, thirty-one".