23212357770557 has 2 divisors, whose sum is σ = 23212357770558. Its totient is φ = 23212357770556.

The previous prime is 23212357770467. The next prime is 23212357770631. The reversal of 23212357770557 is 75507775321232.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15811232079556 + 7401125691001 = 3976334^2 + 2720501^2 .

It is a cyclic number.

It is not a de Polignac number, because 23212357770557 - 2⁴² = 18814311259453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23212357770257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11606178885278 + 11606178885279.

It is an arithmetic number, because the mean of its divisors is an integer number (11606178885279).

Almost surely, 2^{23212357770557} is an apocalyptic number.

It is an amenable number.

23212357770557 is a deficient number, since it is larger than the sum of its proper divisors (1).

23212357770557 is an equidigital number, since it uses as much as digits as its factorization.

23212357770557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21609000, while the sum is 56.

The spelling of 23212357770557 in words is "twenty-three trillion, two hundred twelve billion, three hundred fifty-seven million, seven hundred seventy thousand, five hundred fifty-seven".