16274694721 has 2 divisors, whose sum is σ = 16274694722. Its totient is φ = 16274694720.

The previous prime is 16274694719. The next prime is 16274694767. The reversal of 16274694721 is 12749647261.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14819653696 + 1455041025 = 121736^2 + 38145^2 .

It is a cyclic number.

It is not a de Polignac number, because 16274694721 - 2¹ = 16274694719 is a prime.

Together with 16274694719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (16274694791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8137347360 + 8137347361.

It is an arithmetic number, because the mean of its divisors is an integer number (8137347361).

Almost surely, 2^16274694721 is an apocalyptic number.

It is an amenable number.

16274694721 is a deficient number, since it is larger than the sum of its proper divisors (1).

16274694721 is an equidigital number, since it uses as much as digits as its factorization.

16274694721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 49.

The spelling of 16274694721 in words is "sixteen billion, two hundred seventy-four million, six hundred ninety-four thousand, seven hundred twenty-one".