137622661621 has 2 divisors, whose sum is σ = 137622661622. Its totient is φ = 137622661620.

The previous prime is 137622661619. The next prime is 137622661651. The reversal of 137622661621 is 126166226731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136337439121 + 1285222500 = 369239^2 + 35850^2 .

It is a cyclic number.

It is not a de Polignac number, because 137622661621 - 2¹ = 137622661619 is a prime.

Together with 137622661619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137622661651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68811330810 + 68811330811.

It is an arithmetic number, because the mean of its divisors is an integer number (68811330811).

Almost surely, 2^137622661621 is an apocalyptic number.

It is an amenable number.

137622661621 is a deficient number, since it is larger than the sum of its proper divisors (1).

137622661621 is an equidigital number, since it uses as much as digits as its factorization.

137622661621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 43.

The spelling of 137622661621 in words is "one hundred thirty-seven billion, six hundred twenty-two million, six hundred sixty-one thousand, six hundred twenty-one".