20101563660426 has 16 divisors (see below), whose sum is σ = 40204683419328. Its totient is φ = 6700261870400.

The previous prime is 20101563660403. The next prime is 20101563660511. The reversal of 20101563660426 is 62406636510102.

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, 64669470 + ... + 64979561.

It is an arithmetic number, because the mean of its divisors is an integer number (2512792713708).

Almost surely, 2^{20101563660426} is an apocalyptic number.

20101563660426 is an abundant number, since it is smaller than the sum of its proper divisors (20103119758902).

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

20101563660426 is a wasteful number, since it uses less digits than its factorization.

20101563660426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129674877.

The product of its (nonzero) digits is 311040, while the sum is 42.

The spelling of 20101563660426 in words is "twenty trillion, one hundred one billion, five hundred sixty-three million, six hundred sixty thousand, four hundred twenty-six".