126642789534978 has 12 divisors (see below), whose sum is σ = 274392710659158. Its totient is φ = 42214263178320.

The previous prime is 126642789534953. The next prime is 126642789535063. The reversal of 126642789534978 is 879435987246621.

126642789534978 is a `hidden beast` number, since 1 + 2 + 6 + 6 + 4 + 2 + 7 + 8 + 9 + 534 + 9 + 78 = 666.

126642789534978 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 97723960404849 + 28918829130129 = 9885543^2 + 5377623^2 .

It is a super-2 number, since 2×126642789534978² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 126642789534897 and 126642789534906.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3517855264843 + ... + 3517855264878.

Almost surely, 2^{126642789534978} is an apocalyptic number.

126642789534978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

126642789534978 is an abundant number, since it is smaller than the sum of its proper divisors (147749921124180).

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

126642789534978 is a wasteful number, since it uses less digits than its factorization.

126642789534978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7035710529729 (or 7035710529726 counting only the distinct ones).

The product of its digits is 8778792960, while the sum is 81.

The spelling of 126642789534978 in words is "one hundred twenty-six trillion, six hundred forty-two billion, seven hundred eighty-nine million, five hundred thirty-four thousand, nine hundred seventy-eight".