137877617861 has 2 divisors, whose sum is σ = 137877617862. Its totient is φ = 137877617860.

The previous prime is 137877617791. The next prime is 137877617879. The reversal of 137877617861 is 168716778731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109184645761 + 28692972100 = 330431^2 + 169390^2 .

It is a cyclic number.

It is not a de Polignac number, because 137877617861 - 2¹⁰ = 137877616837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 137877617794 and 137877617803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137877610861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68938808930 + 68938808931.

It is an arithmetic number, because the mean of its divisors is an integer number (68938808931).

Almost surely, 2^137877617861 is an apocalyptic number.

It is an amenable number.

137877617861 is a deficient number, since it is larger than the sum of its proper divisors (1).

137877617861 is an equidigital number, since it uses as much as digits as its factorization.

137877617861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16595712, while the sum is 62.

The spelling of 137877617861 in words is "one hundred thirty-seven billion, eight hundred seventy-seven million, six hundred seventeen thousand, eight hundred sixty-one".