79638629401 has 2 divisors, whose sum is σ = 79638629402. Its totient is φ = 79638629400.

The previous prime is 79638629383. The next prime is 79638629449. The reversal of 79638629401 is 10492683697.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55131040000 + 24507589401 = 234800^2 + 156549^2 .

It is a cyclic number.

It is not a de Polignac number, because 79638629401 - 2⁹ = 79638628889 is a prime.

It is a super-2 number, since 2×79638629401² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (79638629491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39819314700 + 39819314701.

It is an arithmetic number, because the mean of its divisors is an integer number (39819314701).

Almost surely, 2^79638629401 is an apocalyptic number.

It is an amenable number.

79638629401 is a deficient number, since it is larger than the sum of its proper divisors (1).

79638629401 is an equidigital number, since it uses as much as digits as its factorization.

79638629401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3919104, while the sum is 55.

The spelling of 79638629401 in words is "seventy-nine billion, six hundred thirty-eight million, six hundred twenty-nine thousand, four hundred one".