42551620621344 has 72 divisors (see below), whose sum is σ = 122464076887152. Its totient is φ = 14012983489920.

The previous prime is 42551620621337. The next prime is 42551620621351. The reversal of 42551620621344 is 44312602615524.

It is a happy number.

42551620621344 is a `hidden beast` number, since 4 + 2 + 5 + 5 + 1 + 620 + 6 + 2 + 13 + 4 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (42551620621337) and next prime (42551620621351).

It is a tau number, because it is divible by the number of its divisors (72).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 42551620621344.

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, 890028402 + ... + 890076209.

It is an arithmetic number, because the mean of its divisors is an integer number (1700889956766).

Almost surely, 2^{42551620621344} is an apocalyptic number.

It is an amenable number.

42551620621344 is an abundant number, since it is smaller than the sum of its proper divisors (79912456265808).

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

42551620621344 is a wasteful number, since it uses less digits than its factorization.

42551620621344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1780104710 (or 1780104699 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 45.

The spelling of 42551620621344 in words is "forty-two trillion, five hundred fifty-one billion, six hundred twenty million, six hundred twenty-one thousand, three hundred forty-four".