641391529040 has 40 divisors (see below), whose sum is σ = 1491453240288. Its totient is φ = 256519117440.

The previous prime is 641391528923. The next prime is 641391529061. The reversal of 641391529040 is 40925193146.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×641391529040² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 641391528982 and 641391529000.

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 7 ways as a sum of consecutive naturals, for example, 31766 + ... + 1133045.

Almost surely, 2^641391529040 is an apocalyptic number.

It is an amenable number.

641391529040 is an abundant number, since it is smaller than the sum of its proper divisors (850061711248).

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

641391529040 is a wasteful number, since it uses less digits than its factorization.

641391529040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1171707 (or 1171701 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 44.

The spelling of 641391529040 in words is "six hundred forty-one billion, three hundred ninety-one million, five hundred twenty-nine thousand, forty".