20655150961 has 3 divisors (see below), whose sum is σ = 20655294681. Its totient is φ = 20655007242.

The previous prime is 20655150931. The next prime is 20655151001. The reversal of 20655150961 is 16905155602.

The square root of 20655150961 is 143719.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 20655150961 - 2⁷ = 20655150833 is a prime.

It is a super-2 number, since 2×20655150961² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20655150911) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 71860 + ... + 215578.

It is an arithmetic number, because the mean of its divisors is an integer number (6885098227).

Almost surely, 2^20655150961 is an apocalyptic number.

20655150961 is the 143719-th square number.

20655150961 is the 71860-th centered octagonal number.

It is an amenable number.

20655150961 is a deficient number, since it is larger than the sum of its proper divisors (143720).

20655150961 is an frugal number, since it uses more digits than its factorization.

20655150961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287438 (or 143719 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 40.

The spelling of 20655150961 in words is "twenty billion, six hundred fifty-five million, one hundred fifty thousand, nine hundred sixty-one".