136621771638 has 32 divisors (see below), whose sum is σ = 299320762752. Its totient is φ = 41228745600.

The previous prime is 136621771567. The next prime is 136621771639. The reversal of 136621771638 is 836177126631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136621771639) 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, 4278756 + ... + 4310567.

It is an arithmetic number, because the mean of its divisors is an integer number (9353773836).

Almost surely, 2^136621771638 is an apocalyptic number.

136621771638 is an abundant number, since it is smaller than the sum of its proper divisors (162698991114).

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

136621771638 is a wasteful number, since it uses less digits than its factorization.

136621771638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8589580.

The product of its digits is 1524096, while the sum is 51.

The spelling of 136621771638 in words is "one hundred thirty-six billion, six hundred twenty-one million, seven hundred seventy-one thousand, six hundred thirty-eight".