78121522006 has 16 divisors (see below), whose sum is σ = 127839753360. Its totient is φ = 35508522880.

The previous prime is 78121522001. The next prime is 78121522049. The reversal of 78121522006 is 60022512187.

It is a happy number.

It is a super-2 number, since 2×78121522006² (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 (78121522001) 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, 894810 + ... + 978226.

It is an arithmetic number, because the mean of its divisors is an integer number (7989984585).

Almost surely, 2^78121522006 is an apocalyptic number.

78121522006 is a deficient number, since it is larger than the sum of its proper divisors (49718231354).

78121522006 is a wasteful number, since it uses less digits than its factorization.

78121522006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125999.

The product of its (nonzero) digits is 13440, while the sum is 34.

The spelling of 78121522006 in words is "seventy-eight billion, one hundred twenty-one million, five hundred twenty-two thousand, six".