10021623661 has 4 divisors (see below), whose sum is σ = 11453284192. Its totient is φ = 8589963132.

The previous prime is 10021623643. The next prime is 10021623683. The reversal of 10021623661 is 16632612001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10021623661 - 2⁵ = 10021623629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10021623461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 715830255 + ... + 715830268.

It is an arithmetic number, because the mean of its divisors is an integer number (2863321048).

Almost surely, 2^10021623661 is an apocalyptic number.

It is an amenable number.

10021623661 is a deficient number, since it is larger than the sum of its proper divisors (1431660531).

10021623661 is an equidigital number, since it uses as much as digits as its factorization.

10021623661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1431660530.

The product of its (nonzero) digits is 2592, while the sum is 28.

The spelling of 10021623661 in words is "ten billion, twenty-one million, six hundred twenty-three thousand, six hundred sixty-one".