137770872581 has 4 divisors (see below), whose sum is σ = 137785678464. Its totient is φ = 137756066700.

The previous prime is 137770872557. The next prime is 137770872587. The reversal of 137770872581 is 185278077731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 185278077731 = 23 ⋅8055568597.

It is a cyclic number.

It is not a de Polignac number, because 137770872581 - 2³⁴ = 120591003397 is a prime.

It is a super-2 number, since 2×137770872581² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137770872587) 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, 7388975 + ... + 7407596.

It is an arithmetic number, because the mean of its divisors is an integer number (34446419616).

Almost surely, 2^137770872581 is an apocalyptic number.

It is an amenable number.

137770872581 is a deficient number, since it is larger than the sum of its proper divisors (14805883).

137770872581 is an equidigital number, since it uses as much as digits as its factorization.

137770872581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14805882.

The product of its (nonzero) digits is 4609920, while the sum is 56.

The spelling of 137770872581 in words is "one hundred thirty-seven billion, seven hundred seventy million, eight hundred seventy-two thousand, five hundred eighty-one".