218707751961 has 12 divisors (see below), whose sum is σ = 315915545088. Its totient is φ = 145803161304.

The previous prime is 218707751957. The next prime is 218707752017. The reversal of 218707751961 is 169157707812.

It is not a de Polignac number, because 218707751961 - 2² = 218707751957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 218707751898 and 218707751907.

It is not an unprimeable number, because it can be changed into a prime (218707751861) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 846456 + ... + 1074198.

It is an arithmetic number, because the mean of its divisors is an integer number (26326295424).

Almost surely, 2^218707751961 is an apocalyptic number.

It is an amenable number.

218707751961 is a deficient number, since it is larger than the sum of its proper divisors (97207793127).

218707751961 is a wasteful number, since it uses less digits than its factorization.

218707751961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334452 (or 334449 counting only the distinct ones).

The product of its (nonzero) digits is 1481760, while the sum is 54.

The spelling of 218707751961 in words is "two hundred eighteen billion, seven hundred seven million, seven hundred fifty-one thousand, nine hundred sixty-one".