15553557401 has 2 divisors, whose sum is σ = 15553557402. Its totient is φ = 15553557400.

The previous prime is 15553557373. The next prime is 15553557407. The reversal of 15553557401 is 10475535551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13242255625 + 2311301776 = 115075^2 + 48076^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15553557401 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (15553557407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7776778700 + 7776778701.

It is an arithmetic number, because the mean of its divisors is an integer number (7776778701).

Almost surely, 2^15553557401 is an apocalyptic number.

It is an amenable number.

15553557401 is a deficient number, since it is larger than the sum of its proper divisors (1).

15553557401 is an equidigital number, since it uses as much as digits as its factorization.

15553557401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 262500, while the sum is 41.

The spelling of 15553557401 in words is "fifteen billion, five hundred fifty-three million, five hundred fifty-seven thousand, four hundred one".