213558703656 has 32 divisors (see below), whose sum is σ = 534134921760. Its totient is φ = 71154479552.

The previous prime is 213558703637. The next prime is 213558703661. The reversal of 213558703656 is 656307855312.

It is a junction number, because it is equal to n+sod(n) for n = 213558703599 and 213558703608.

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, 1929735 + ... + 2037398.

It is an arithmetic number, because the mean of its divisors is an integer number (16691716305).

Almost surely, 2^213558703656 is an apocalyptic number.

It is an amenable number.

213558703656 is an abundant number, since it is smaller than the sum of its proper divisors (320576218104).

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

213558703656 is a wasteful number, since it uses less digits than its factorization.

213558703656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3969385 (or 3969381 counting only the distinct ones).

The product of its (nonzero) digits is 4536000, while the sum is 51.

The spelling of 213558703656 in words is "two hundred thirteen billion, five hundred fifty-eight million, seven hundred three thousand, six hundred fifty-six".