20155645506 has 16 divisors (see below), whose sum is σ = 41248763424. Its totient is φ = 6562303104.

The previous prime is 20155645483. The next prime is 20155645513. The reversal of 20155645506 is 60554655102.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39061071 + ... + 39061586.

It is an arithmetic number, because the mean of its divisors is an integer number (2578047714).

Almost surely, 2^20155645506 is an apocalyptic number.

20155645506 is an abundant number, since it is smaller than the sum of its proper divisors (21093117918).

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

20155645506 is a wasteful number, since it uses less digits than its factorization.

20155645506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78122705.

The product of its (nonzero) digits is 180000, while the sum is 39.

The spelling of 20155645506 in words is "twenty billion, one hundred fifty-five million, six hundred forty-five thousand, five hundred six".