137753986621 has 4 divisors (see below), whose sum is σ = 137759629852. Its totient is φ = 137748343392.

The previous prime is 137753986613. The next prime is 137753986633. The reversal of 137753986621 is 126689357731.

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

It can be written as a sum of positive squares in 2 ways, for example, as 22917720996 + 114836265625 = 151386^2 + 338875^2 .

It is a cyclic number.

It is not a de Polignac number, because 137753986621 - 2³ = 137753986613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137753986661) 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, 2784840 + ... + 2833873.

It is an arithmetic number, because the mean of its divisors is an integer number (34439907463).

Almost surely, 2^137753986621 is an apocalyptic number.

It is an amenable number.

137753986621 is a deficient number, since it is larger than the sum of its proper divisors (5643231).

137753986621 is an equidigital number, since it uses as much as digits as its factorization.

137753986621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5643230.

The product of its digits is 11430720, while the sum is 58.

The spelling of 137753986621 in words is "one hundred thirty-seven billion, seven hundred fifty-three million, nine hundred eighty-six thousand, six hundred twenty-one".