21766670612 has 6 divisors (see below), whose sum is σ = 38091673578. Its totient is φ = 10883335304.

The previous prime is 21766670603. The next prime is 21766670641. The reversal of 21766670612 is 21607666712.

It can be written as a sum of positive squares in only one way, i.e., 18529743376 + 3236927236 = 136124^2 + 56894^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2720833823 + ... + 2720833830.

It is an arithmetic number, because the mean of its divisors is an integer number (6348612263).

Almost surely, 2^21766670612 is an apocalyptic number.

It is an amenable number.

21766670612 is a deficient number, since it is larger than the sum of its proper divisors (16325002966).

21766670612 is a wasteful number, since it uses less digits than its factorization.

21766670612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5441667657 (or 5441667655 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 44.

The spelling of 21766670612 in words is "twenty-one billion, seven hundred sixty-six million, six hundred seventy thousand, six hundred twelve".