212656618951 has 24 divisors (see below), whose sum is σ = 260430720000. Its totient is φ = 172660454064.

The previous prime is 212656618949. The next prime is 212656618963. The reversal of 212656618951 is 159816656212.

It is not a de Polignac number, because 212656618951 - 2¹ = 212656618949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212656618901) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12074650 + ... + 12092248.

It is an arithmetic number, because the mean of its divisors is an integer number (10851280000).

Almost surely, 2^212656618951 is an apocalyptic number.

212656618951 is a deficient number, since it is larger than the sum of its proper divisors (47774101049).

212656618951 is a wasteful number, since it uses less digits than its factorization.

212656618951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30611 (or 30604 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 52.

The spelling of 212656618951 in words is "two hundred twelve billion, six hundred fifty-six million, six hundred eighteen thousand, nine hundred fifty-one".