1238866617051 has 24 divisors (see below), whose sum is σ = 2115634291680. Its totient is φ = 683512615296.

The previous prime is 1238866617007. The next prime is 1238866617061. The reversal of 1238866617051 is 1507166688321.

It is a happy number.

It is not a de Polignac number, because 1238866617051 - 2¹⁵ = 1238866584283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1238866617061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 339042130 + ... + 339045783.

It is an arithmetic number, because the mean of its divisors is an integer number (88151428820).

Almost surely, 2^{1238866617051} is an apocalyptic number.

1238866617051 is a deficient number, since it is larger than the sum of its proper divisors (876767674629).

1238866617051 is a wasteful number, since it uses less digits than its factorization.

1238866617051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678087955 (or 678087952 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The spelling of 1238866617051 in words is "one trillion, two hundred thirty-eight billion, eight hundred sixty-six million, six hundred seventeen thousand, fifty-one".