1251505052055 has 80 divisors (see below), whose sum is σ = 2303049538944. Its totient is φ = 649881169920.

The previous prime is 1251505052053. The next prime is 1251505052071. The reversal of 1251505052055 is 5502505051521.

1251505052055 is a `hidden beast` number, since 1 + 2 + 51 + 50 + 505 + 2 + 0 + 55 = 666.

It is not a de Polignac number, because 1251505052055 - 2¹ = 1251505052053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251505052053) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3503425 + ... + 3844085.

Almost surely, 2^{1251505052055} is an apocalyptic number.

1251505052055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1251505052055 is a deficient number, since it is larger than the sum of its proper divisors (1051544486889).

1251505052055 is a wasteful number, since it uses less digits than its factorization.

1251505052055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340918 (or 340909 counting only the distinct ones).

The product of its (nonzero) digits is 62500, while the sum is 36.

The spelling of 1251505052055 in words is "one trillion, two hundred fifty-one billion, five hundred five million, fifty-two thousand, fifty-five".