78501478801021 has 8 divisors (see below), whose sum is σ = 79211707427840. Its totient is φ = 77792689342368.

The previous prime is 78501478801007. The next prime is 78501478801111. The reversal of 78501478801021 is 12010887410587.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78501478801021 - 2⁹ = 78501478800509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78501478801021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78501478301021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 359682456 + ... + 359900641.

It is an arithmetic number, because the mean of its divisors is an integer number (9901463428480).

Almost surely, 2^{78501478801021} is an apocalyptic number.

It is an amenable number.

78501478801021 is a deficient number, since it is larger than the sum of its proper divisors (710228626819).

78501478801021 is a wasteful number, since it uses less digits than its factorization.

78501478801021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719584083.

The product of its (nonzero) digits is 1003520, while the sum is 52.

The spelling of 78501478801021 in words is "seventy-eight trillion, five hundred one billion, four hundred seventy-eight million, eight hundred one thousand, twenty-one".