23557321537 has 2 divisors, whose sum is σ = 23557321538. Its totient is φ = 23557321536.

The previous prime is 23557321517. The next prime is 23557321553. The reversal of 23557321537 is 73512375532.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23223016881 + 334304656 = 152391^2 + 18284^2 .

It is a cyclic number.

It is not a de Polignac number, because 23557321537 - 2¹⁹ = 23556797249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23557321493 and 23557321502.

It is not a weakly prime, because it can be changed into another prime (23557321517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11778660768 + 11778660769.

It is an arithmetic number, because the mean of its divisors is an integer number (11778660769).

Almost surely, 2^23557321537 is an apocalyptic number.

It is an amenable number.

23557321537 is a deficient number, since it is larger than the sum of its proper divisors (1).

23557321537 is an equidigital number, since it uses as much as digits as its factorization.

23557321537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 661500, while the sum is 43.

The spelling of 23557321537 in words is "twenty-three billion, five hundred fifty-seven million, three hundred twenty-one thousand, five hundred thirty-seven".