155620619565 has 16 divisors (see below), whose sum is σ = 253690973568. Its totient is φ = 81431669696.

The previous prime is 155620619563. The next prime is 155620619573. The reversal of 155620619565 is 565916026551.

It is a cyclic number.

It is not a de Polignac number, because 155620619565 - 2¹ = 155620619563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155620619563) 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, 97873809 + ... + 97875398.

It is an arithmetic number, because the mean of its divisors is an integer number (15855685848).

Almost surely, 2^155620619565 is an apocalyptic number.

155620619565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

155620619565 is a deficient number, since it is larger than the sum of its proper divisors (98070354003).

155620619565 is a wasteful number, since it uses less digits than its factorization.

155620619565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195749268.

The product of its (nonzero) digits is 2430000, while the sum is 51.

The spelling of 155620619565 in words is "one hundred fifty-five billion, six hundred twenty million, six hundred nineteen thousand, five hundred sixty-five".