641654377 has 64 divisors (see below), whose sum is σ = 877363200. Its totient is φ = 455051520.

The previous prime is 641654371. The next prime is 641654381. The reversal of 641654377 is 773456146.

It is not a de Polignac number, because 641654377 - 2⁷ = 641654249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (641654371) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3359352 + ... + 3359542.

It is an arithmetic number, because the mean of its divisors is an integer number (13708800).

Almost surely, 2^641654377 is an apocalyptic number.

641654377 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

641654377 is a deficient number, since it is larger than the sum of its proper divisors (235708823).

641654377 is a wasteful number, since it uses less digits than its factorization.

641654377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326.

The product of its digits is 423360, while the sum is 43.

The square root of 641654377 is about 25330.8976745792. The cubic root of 641654377 is about 862.5157886069.

The spelling of 641654377 in words is "six hundred forty-one million, six hundred fifty-four thousand, three hundred seventy-seven".