137644431056 has 20 divisors (see below), whose sum is σ = 290930275104. Its totient is φ = 62565650400.

The previous prime is 137644431053. The next prime is 137644431059. The reversal of 137644431056 is 650134446731.

It is an interprime number because it is at equal distance from previous prime (137644431053) and next prime (137644431059).

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 137644430998 and 137644431016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137644431053) 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, 391035140 + ... + 391035491.

Almost surely, 2^137644431056 is an apocalyptic number.

137644431056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

137644431056 is an abundant number, since it is smaller than the sum of its proper divisors (153285844048).

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

137644431056 is a wasteful number, since it uses less digits than its factorization.

137644431056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782070650 (or 782070644 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 44.

Adding to 137644431056 its reverse (650134446731), we get a palindrome (787778877787).

The spelling of 137644431056 in words is "one hundred thirty-seven billion, six hundred forty-four million, four hundred thirty-one thousand, fifty-six".