126642789534977 has 4 divisors (see below), whose sum is σ = 126791257049940. Its totient is φ = 126494322020016.

The previous prime is 126642789534953. The next prime is 126642789535063. The reversal of 126642789534977 is 779435987246621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64060830447601 + 62581959087376 = 8003801^2 + 7910876^2 .

It is a cyclic number.

It is not a de Polignac number, because 126642789534977 - 2¹⁸ = 126642789272833 is a prime.

It is a super-2 number, since 2×126642789534977² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126642789534077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74233756202 + ... + 74233757907.

It is an arithmetic number, because the mean of its divisors is an integer number (31697814262485).

Almost surely, 2^{126642789534977} is an apocalyptic number.

It is an amenable number.

126642789534977 is a deficient number, since it is larger than the sum of its proper divisors (148467514963).

126642789534977 is an equidigital number, since it uses as much as digits as its factorization.

126642789534977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148467514962.

The product of its digits is 7681443840, while the sum is 80.

The spelling of 126642789534977 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-seven".