16401152257 has 6 divisors (see below), whose sum is σ = 19078891458. Its totient is φ = 14058130464.

The previous prime is 16401152249. The next prime is 16401152263. The reversal of 16401152257 is 75225110461.

It can be written as a sum of positive squares in only one way, i.e., 15863654401 + 537497856 = 125951^2 + 23184^2 .

It is not a de Polignac number, because 16401152257 - 2³ = 16401152249 is a prime.

It is a super-3 number, since 3×16401152257³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16401152057) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 167358648 + ... + 167358745.

It is an arithmetic number, because the mean of its divisors is an integer number (3179815243).

Almost surely, 2^16401152257 is an apocalyptic number.

It is an amenable number.

16401152257 is a deficient number, since it is larger than the sum of its proper divisors (2677739201).

16401152257 is an equidigital number, since it uses as much as digits as its factorization.

16401152257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334717407 (or 334717400 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 34.

The spelling of 16401152257 in words is "sixteen billion, four hundred one million, one hundred fifty-two thousand, two hundred fifty-seven".