20155811855102 has 64 divisors (see below), whose sum is σ = 39344685907968. Its totient is φ = 7509223260000.

The previous prime is 20155811855057. The next prime is 20155811855161.

20155811855102 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10944227 + ... + 12652577.

It is an arithmetic number, because the mean of its divisors is an integer number (614760717312).

Almost surely, 2^{20155811855102} is an apocalyptic number.

20155811855102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20155811855102 is a deficient number, since it is larger than the sum of its proper divisors (19188874052866).

20155811855102 is a wasteful number, since it uses less digits than its factorization.

20155811855102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1711725.

The product of its (nonzero) digits is 160000, while the sum is 44.

The spelling of 20155811855102 in words is "twenty trillion, one hundred fifty-five billion, eight hundred eleven million, eight hundred fifty-five thousand, one hundred two".