137866501638 has 48 divisors (see below), whose sum is σ = 318175996320. Its totient is φ = 42993224448.

The previous prime is 137866501631. The next prime is 137866501639. The reversal of 137866501638 is 836105668731.

137866501638 is a `hidden beast` number, since 1 + 3 + 78 + 6 + 6 + 501 + 63 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137866501631) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1297833 + ... + 1400036.

It is an arithmetic number, because the mean of its divisors is an integer number (6628666590).

Almost surely, 2^137866501638 is an apocalyptic number.

137866501638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

137866501638 is an abundant number, since it is smaller than the sum of its proper divisors (180309494682).

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

137866501638 is a wasteful number, since it uses less digits than its factorization.

137866501638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2698061 (or 2698058 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 54.

The spelling of 137866501638 in words is "one hundred thirty-seven billion, eight hundred sixty-six million, five hundred one thousand, six hundred thirty-eight".