137813878577 has 4 divisors (see below), whose sum is σ = 141538578036. Its totient is φ = 134089179120.

The previous prime is 137813878567. The next prime is 137813878583. The reversal of 137813878577 is 775878318731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 775878318731 = 197 ⋅3938468623.

It can be written as a sum of positive squares in 2 ways, for example, as 125345029681 + 12468848896 = 354041^2 + 111664^2 .

It is a cyclic number.

It is not a de Polignac number, because 137813878577 - 2¹² = 137813874481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137813878567) 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, 1862349674 + ... + 1862349747.

It is an arithmetic number, because the mean of its divisors is an integer number (35384644509).

Almost surely, 2^137813878577 is an apocalyptic number.

It is an amenable number.

137813878577 is a deficient number, since it is larger than the sum of its proper divisors (3724699459).

137813878577 is an equidigital number, since it uses as much as digits as its factorization.

137813878577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3724699458.

The product of its digits is 55319040, while the sum is 65.

The spelling of 137813878577 in words is "one hundred thirty-seven billion, eight hundred thirteen million, eight hundred seventy-eight thousand, five hundred seventy-seven".