1538655497977 has 4 divisors (see below), whose sum is σ = 1657013613220. Its totient is φ = 1420297382736.

The previous prime is 1538655497969. The next prime is 1538655497989. The reversal of 1538655497977 is 7797945568351.

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 713862769216 + 824792728761 = 844904^2 + 908181^2 .

It is a cyclic number.

It is not a de Polignac number, because 1538655497977 - 2³ = 1538655497969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1538655497917) 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, 59179057602 + ... + 59179057627.

It is an arithmetic number, because the mean of its divisors is an integer number (414253403305).

Almost surely, 2^{1538655497977} is an apocalyptic number.

It is an amenable number.

1538655497977 is a deficient number, since it is larger than the sum of its proper divisors (118358115243).

1538655497977 is a wasteful number, since it uses less digits than its factorization.

1538655497977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118358115242.

The product of its digits is 2000376000, while the sum is 76.

The spelling of 1538655497977 in words is "one trillion, five hundred thirty-eight billion, six hundred fifty-five million, four hundred ninety-seven thousand, nine hundred seventy-seven".