78315619501 has 12 divisors (see below), whose sum is σ = 93323841660. Its totient is φ = 65490411840.

The previous prime is 78315619489. The next prime is 78315619507. The reversal of 78315619501 is 10591651387.

It can be written as a sum of positive squares in 2 ways, for example, as 2751107401 + 75564512100 = 52451^2 + 274890^2 .

It is not a de Polignac number, because 78315619501 - 2¹⁵ = 78315586733 is a prime.

It is a super-2 number, since 2×78315619501² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78315619507) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19489186 + ... + 19493203.

It is an arithmetic number, because the mean of its divisors is an integer number (7776986805).

Almost surely, 2^78315619501 is an apocalyptic number.

It is an amenable number.

78315619501 is a deficient number, since it is larger than the sum of its proper divisors (15008222159).

78315619501 is a wasteful number, since it uses less digits than its factorization.

78315619501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38982444 (or 38982437 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 46.

The spelling of 78315619501 in words is "seventy-eight billion, three hundred fifteen million, six hundred nineteen thousand, five hundred one".