137731621227658 has 4 divisors (see below), whose sum is σ = 206597431841490. Its totient is φ = 68865810613828.

The previous prime is 137731621227637. The next prime is 137731621227659. The reversal of 137731621227658 is 856722126137731.

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

It can be written as a sum of positive squares in only one way, i.e., 136948904135289 + 782717092369 = 11702517^2 + 884713^2 .

It is a junction number, because it is equal to n+sod(n) for n = 137731621227596 and 137731621227605.

It is not an unprimeable number, because it can be changed into a prime (137731621227659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34432905306913 + ... + 34432905306916.

Almost surely, 2^{137731621227658} is an apocalyptic number.

137731621227658 is a deficient number, since it is larger than the sum of its proper divisors (68865810613832).

137731621227658 is an equidigital number, since it uses as much as digits as its factorization.

137731621227658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68865810613831.

The product of its digits is 35562240, while the sum is 61.

The spelling of 137731621227658 in words is "one hundred thirty-seven trillion, seven hundred thirty-one billion, six hundred twenty-one million, two hundred twenty-seven thousand, six hundred fifty-eight".