15679629949 has 2 divisors, whose sum is σ = 15679629950. Its totient is φ = 15679629948.

The previous prime is 15679629947. The next prime is 15679630063. The reversal of 15679629949 is 94992697651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15346749924 + 332880025 = 123882^2 + 18245^2 .

It is a cyclic number.

It is not a de Polignac number, because 15679629949 - 2¹ = 15679629947 is a prime.

Together with 15679629947, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15679629947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7839814974 + 7839814975.

It is an arithmetic number, because the mean of its divisors is an integer number (7839814975).

Almost surely, 2^15679629949 is an apocalyptic number.

It is an amenable number.

15679629949 is a deficient number, since it is larger than the sum of its proper divisors (1).

15679629949 is an equidigital number, since it uses as much as digits as its factorization.

15679629949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 66134880, while the sum is 67.

The spelling of 15679629949 in words is "fifteen billion, six hundred seventy-nine million, six hundred twenty-nine thousand, nine hundred forty-nine".