16457634637 has 4 divisors (see below), whose sum is σ = 16457896476. Its totient is φ = 16457372800.

The previous prime is 16457634587. The next prime is 16457634649. The reversal of 16457634637 is 73643675461.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 12828054121 + 3629580516 = 113261^2 + 60246^2 .

It is a cyclic number.

It is not a de Polignac number, because 16457634637 - 2⁷ = 16457634509 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 (16457634667) 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, 26283 + ... + 183319.

It is an arithmetic number, because the mean of its divisors is an integer number (4114474119).

Almost surely, 2^16457634637 is an apocalyptic number.

It is an amenable number.

16457634637 is a deficient number, since it is larger than the sum of its proper divisors (261839).

16457634637 is a wasteful number, since it uses less digits than its factorization.

16457634637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261838.

The product of its digits is 7620480, while the sum is 52.

The spelling of 16457634637 in words is "sixteen billion, four hundred fifty-seven million, six hundred thirty-four thousand, six hundred thirty-seven".