10721866156 has 6 divisors (see below), whose sum is σ = 18763265780. Its totient is φ = 5360933076.

The previous prime is 10721866147. The next prime is 10721866157. The reversal of 10721866156 is 65166812701.

It is a super-2 number, since 2×10721866156² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (10721866157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1340233266 + ... + 1340233273.

Almost surely, 2^10721866156 is an apocalyptic number.

It is an amenable number.

10721866156 is a deficient number, since it is larger than the sum of its proper divisors (8041399624).

10721866156 is a wasteful number, since it uses less digits than its factorization.

10721866156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2680466543 (or 2680466541 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 43.

The spelling of 10721866156 in words is "ten billion, seven hundred twenty-one million, eight hundred sixty-six thousand, one hundred fifty-six".