641903657 has 16 divisors (see below), whose sum is σ = 695520000. Its totient is φ = 590523984.

The previous prime is 641903653. The next prime is 641903681. The reversal of 641903657 is 756309146.

It is a cyclic number.

It is not a de Polignac number, because 641903657 - 2² = 641903653 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641903651) 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, 89594 + ... + 96492.

It is an arithmetic number, because the mean of its divisors is an integer number (43470000).

Almost surely, 2^641903657 is an apocalyptic number.

It is an amenable number.

641903657 is a deficient number, since it is larger than the sum of its proper divisors (53616343).

641903657 is a wasteful number, since it uses less digits than its factorization.

641903657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7060.

The product of its (nonzero) digits is 136080, while the sum is 41.

The square root of 641903657 is about 25335.8176698523. The cubic root of 641903657 is about 862.6274687191.

The spelling of 641903657 in words is "six hundred forty-one million, nine hundred three thousand, six hundred fifty-seven".