641502157478 has 32 divisors (see below), whose sum is σ = 1209509812224. Its totient is φ = 248381472672.

The previous prime is 641502157469. The next prime is 641502157481. The reversal of 641502157478 is 874751205146.

It is a super-2 number, since 2×641502157478² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37488650 + ... + 37505757.

It is an arithmetic number, because the mean of its divisors is an integer number (37797181632).

Almost surely, 2^641502157478 is an apocalyptic number.

641502157478 is a deficient number, since it is larger than the sum of its proper divisors (568007654746).

641502157478 is a wasteful number, since it uses less digits than its factorization.

641502157478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74994476.

The product of its (nonzero) digits is 1881600, while the sum is 50.

The spelling of 641502157478 in words is "six hundred forty-one billion, five hundred two million, one hundred fifty-seven thousand, four hundred seventy-eight".