1387640012525 has 24 divisors (see below), whose sum is σ = 1871380031304. Its totient is φ = 1014573024000.

The previous prime is 1387640012503. The next prime is 1387640012567. The reversal of 1387640012525 is 5252100467831.

It can be written as a sum of positive squares in 12 ways, for example, as 25783688329 + 1361856324196 = 160573^2 + 1166986^2 .

It is not a de Polignac number, because 1387640012525 - 2¹⁶ = 1387639946989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

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, 21104114 + ... + 21169763.

It is an arithmetic number, because the mean of its divisors is an integer number (77974167971).

Almost surely, 2^{1387640012525} is an apocalyptic number.

It is an amenable number.

1387640012525 is a deficient number, since it is larger than the sum of its proper divisors (483740018779).

1387640012525 is a wasteful number, since it uses less digits than its factorization.

1387640012525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42274001 (or 42273996 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 44.

The spelling of 1387640012525 in words is "one trillion, three hundred eighty-seven billion, six hundred forty million, twelve thousand, five hundred twenty-five".