78121455053 has 16 divisors (see below), whose sum is σ = 83606042160. Its totient is φ = 72736896000.

The previous prime is 78121455043. The next prime is 78121455079. The reversal of 78121455053 is 35055412187.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 20301405289 + 57820049764 = 142483^2 + 240458^2 .

It is a cyclic number.

It is not a de Polignac number, because 78121455053 - 2⁴ = 78121455037 is a prime.

It is a super-2 number, since 2×78121455053² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78121455053.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78121455043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2091683 + ... + 2128703.

It is an arithmetic number, because the mean of its divisors is an integer number (5225377635).

Almost surely, 2^78121455053 is an apocalyptic number.

It is an amenable number.

78121455053 is a deficient number, since it is larger than the sum of its proper divisors (5484587107).

78121455053 is a wasteful number, since it uses less digits than its factorization.

78121455053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38368.

The product of its (nonzero) digits is 168000, while the sum is 41.

The spelling of 78121455053 in words is "seventy-eight billion, one hundred twenty-one million, four hundred fifty-five thousand, fifty-three".