1252661356187 has 4 divisors (see below), whose sum is σ = 1256612969616. Its totient is φ = 1248709742760.

The previous prime is 1252661356153. The next prime is 1252661356259. The reversal of 1252661356187 is 7816531662521.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1252661356187 - 2²⁸ = 1252392920731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1252661356127) 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, 1975806239 + ... + 1975806872.

It is an arithmetic number, because the mean of its divisors is an integer number (314153242404).

Almost surely, 2^{1252661356187} is an apocalyptic number.

1252661356187 is a deficient number, since it is larger than the sum of its proper divisors (3951613429).

1252661356187 is an equidigital number, since it uses as much as digits as its factorization.

1252661356187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3951613428.

The product of its digits is 3628800, while the sum is 53.

The spelling of 1252661356187 in words is "one trillion, two hundred fifty-two billion, six hundred sixty-one million, three hundred fifty-six thousand, one hundred eighty-seven".