155407205506 has 32 divisors (see below), whose sum is σ = 278477625600. Its totient is φ = 63596814336.

The previous prime is 155407205461. The next prime is 155407205531. The reversal of 155407205506 is 605502704551.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 232431 + ... + 604018.

It is an arithmetic number, because the mean of its divisors is an integer number (8702425800).

Almost surely, 2^155407205506 is an apocalyptic number.

155407205506 is a deficient number, since it is larger than the sum of its proper divisors (123070420094).

155407205506 is a wasteful number, since it uses less digits than its factorization.

155407205506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837058.

The product of its (nonzero) digits is 210000, while the sum is 40.

The spelling of 155407205506 in words is "one hundred fifty-five billion, four hundred seven million, two hundred five thousand, five hundred six".