3961521794560 has 80 divisors (see below), whose sum is σ = 10361855517552. Its totient is φ = 1440553369600.

The previous prime is 3961521794551. The next prime is 3961521794567. The reversal of 3961521794560 is 654971251693.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 3961521794495 and 3961521794504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3961521794567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70311361 + ... + 70367680.

Almost surely, 2^{3961521794560} is an apocalyptic number.

It is an amenable number.

3961521794560 is an abundant number, since it is smaller than the sum of its proper divisors (6400333722992).

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

3961521794560 is a wasteful number, since it uses less digits than its factorization.

3961521794560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140679075 (or 140679059 counting only the distinct ones).

The product of its (nonzero) digits is 12247200, while the sum is 58.

The spelling of 3961521794560 in words is "three trillion, nine hundred sixty-one billion, five hundred twenty-one million, seven hundred ninety-four thousand, five hundred sixty".