1387640275025 has 24 divisors (see below), whose sum is σ = 1736715387000. Its totient is φ = 1099765900800.

The previous prime is 1387640275001. The next prime is 1387640275031. The reversal of 1387640275025 is 5205720467831.

It can be written as a sum of positive squares in 12 ways, for example, as 925644106816 + 461996168209 = 962104^2 + 679703^2 .

It is not a de Polignac number, because 1387640275025 - 2³⁶ = 1318920798289 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20570051 + ... + 20637399.

It is an arithmetic number, because the mean of its divisors is an integer number (72363141125).

Almost surely, 2^{1387640275025} is an apocalyptic number.

It is an amenable number.

1387640275025 is a deficient number, since it is larger than the sum of its proper divisors (349075111975).

1387640275025 is a wasteful number, since it uses less digits than its factorization.

1387640275025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75029 (or 75024 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 50.

The spelling of 1387640275025 in words is "one trillion, three hundred eighty-seven billion, six hundred forty million, two hundred seventy-five thousand, twenty-five".