155420544621 has 16 divisors (see below), whose sum is σ = 211917081600. Its totient is φ = 101288474928.

The previous prime is 155420544613. The next prime is 155420544659. The reversal of 155420544621 is 126445024551.

It is not a de Polignac number, because 155420544621 - 2³ = 155420544613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155420544621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155420540621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2421061 + ... + 2484426.

It is an arithmetic number, because the mean of its divisors is an integer number (13244817600).

Almost surely, 2^155420544621 is an apocalyptic number.

It is an amenable number.

155420544621 is a deficient number, since it is larger than the sum of its proper divisors (56496536979).

155420544621 is a wasteful number, since it uses less digits than its factorization.

155420544621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4905728.

The product of its (nonzero) digits is 192000, while the sum is 39.

The spelling of 155420544621 in words is "one hundred fifty-five billion, four hundred twenty million, five hundred forty-four thousand, six hundred twenty-one".