138780737477 has 8 divisors (see below), whose sum is σ = 141080598240. Its totient is φ = 136481675760.

The previous prime is 138780737471. The next prime is 138780737519. The reversal of 138780737477 is 774737087831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138780737477 - 2²⁴ = 138763960261 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 (138780737471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155678 + ... + 549360.

It is an arithmetic number, because the mean of its divisors is an integer number (17635074780).

Almost surely, 2^138780737477 is an apocalyptic number.

It is an amenable number.

138780737477 is a deficient number, since it is larger than the sum of its proper divisors (2299860763).

138780737477 is an equidigital number, since it uses as much as digits as its factorization.

138780737477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399523.

The product of its (nonzero) digits is 38723328, while the sum is 62.

The spelling of 138780737477 in words is "one hundred thirty-eight billion, seven hundred eighty million, seven hundred thirty-seven thousand, four hundred seventy-seven".