20156522261666 has 32 divisors (see below), whose sum is σ = 36588137477760. Its totient is φ = 8130026624256.

The previous prime is 20156522261621. The next prime is 20156522261677. The reversal of 20156522261666 is 66616222565102.

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, 4077596 + ... + 7545848.

It is an arithmetic number, because the mean of its divisors is an integer number (1143379296180).

Almost surely, 2^{20156522261666} is an apocalyptic number.

20156522261666 is a deficient number, since it is larger than the sum of its proper divisors (16431615216094).

20156522261666 is a wasteful number, since it uses less digits than its factorization.

20156522261666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3492698.

The product of its (nonzero) digits is 3110400, while the sum is 50.

The spelling of 20156522261666 in words is "twenty trillion, one hundred fifty-six billion, five hundred twenty-two million, two hundred sixty-one thousand, six hundred sixty-six".