23666020645 has 16 divisors (see below), whose sum is σ = 28590538608. Its totient is φ = 18805363200.

The previous prime is 23666020621. The next prime is 23666020667. The reversal of 23666020645 is 54602066632.

It can be written as a sum of positive squares in 8 ways, for example, as 386279716 + 23279740929 = 19654^2 + 152577^2 .

It is a de Polignac number, because none of the positive numbers 2^k-23666020645 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23666020598 and 23666020607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4076745 + ... + 4082545.

It is an arithmetic number, because the mean of its divisors is an integer number (1786908663).

Almost surely, 2^23666020645 is an apocalyptic number.

It is an amenable number.

23666020645 is a deficient number, since it is larger than the sum of its proper divisors (4924517963).

23666020645 is a wasteful number, since it uses less digits than its factorization.

23666020645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11160.

The product of its (nonzero) digits is 311040, while the sum is 40.

The spelling of 23666020645 in words is "twenty-three billion, six hundred sixty-six million, twenty thousand, six hundred forty-five".