7645668157620 has 36 divisors (see below), whose sum is σ = 23191860078660. Its totient is φ = 2038844841984.

The previous prime is 7645668157619. The next prime is 7645668157643. The reversal of 7645668157620 is 267518665467.

7645668157620 is a `hidden beast` number, since 7 + 6 + 4 + 56 + 6 + 8 + 1 + 576 + 2 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1897153626384 + 5748514531236 = 1377372^2 + 2397606^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21237966925 + ... + 21237967284.

Almost surely, 2^{7645668157620} is an apocalyptic number.

It is an amenable number.

7645668157620 is an abundant number, since it is smaller than the sum of its proper divisors (15546191921040).

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

7645668157620 is a wasteful number, since it uses less digits than its factorization.

7645668157620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42475934224 (or 42475934219 counting only the distinct ones).

The product of its (nonzero) digits is 101606400, while the sum is 63.

The spelling of 7645668157620 in words is "seven trillion, six hundred forty-five billion, six hundred sixty-eight million, one hundred fifty-seven thousand, six hundred twenty".