21655162651 has 8 divisors (see below), whose sum is σ = 21874551984. Its totient is φ = 21435871200.

The previous prime is 21655162621. The next prime is 21655162681. The reversal of 21655162651 is 15626155612.

It is an interprime number because it is at equal distance from previous prime (21655162621) and next prime (21655162681).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21655162651 - 2³¹ = 19507679003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21655162621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 470596 + ... + 514558.

It is an arithmetic number, because the mean of its divisors is an integer number (2734318998).

Almost surely, 2^21655162651 is an apocalyptic number.

21655162651 is a deficient number, since it is larger than the sum of its proper divisors (219389333).

21655162651 is a wasteful number, since it uses less digits than its factorization.

21655162651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48941.

The product of its digits is 108000, while the sum is 40.

The spelling of 21655162651 in words is "twenty-one billion, six hundred fifty-five million, one hundred sixty-two thousand, six hundred fifty-one".