123572778126 has 32 divisors (see below), whose sum is σ = 282523008768. Its totient is φ = 35297640000.

The previous prime is 123572778107. The next prime is 123572778137. The reversal of 123572778126 is 621877275321.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199375 + ... + 535626.

It is an arithmetic number, because the mean of its divisors is an integer number (8828844024).

Almost surely, 2^123572778126 is an apocalyptic number.

123572778126 is an abundant number, since it is smaller than the sum of its proper divisors (158950230642).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123572778126 is a wasteful number, since it uses less digits than its factorization.

123572778126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739016.

The product of its digits is 1975680, while the sum is 51.

The spelling of 123572778126 in words is "one hundred twenty-three billion, five hundred seventy-two million, seven hundred seventy-eight thousand, one hundred twenty-six".