163557002551 has 4 divisors (see below), whose sum is σ = 163563866704. Its totient is φ = 163550138400.

The previous prime is 163557002461. The next prime is 163557002579. The reversal of 163557002551 is 155200755361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155200755361 = 56731 ⋅2735731.

It is a cyclic number.

It is not a de Polignac number, because 163557002551 - 2⁹ = 163557002039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163557002591) 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, 3396210 + ... + 3444031.

It is an arithmetic number, because the mean of its divisors is an integer number (40890966676).

Almost surely, 2^163557002551 is an apocalyptic number.

163557002551 is a deficient number, since it is larger than the sum of its proper divisors (6864153).

163557002551 is an equidigital number, since it uses as much as digits as its factorization.

163557002551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6864152.

The product of its (nonzero) digits is 157500, while the sum is 40.

The spelling of 163557002551 in words is "one hundred sixty-three billion, five hundred fifty-seven million, two thousand, five hundred fifty-one".