1252777166891 has 8 divisors (see below), whose sum is σ = 1326554568000. Its totient is φ = 1179009168768.

The previous prime is 1252777166887. The next prime is 1252777166911. The reversal of 1252777166891 is 1986617772521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1252777166891 - 2² = 1252777166887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1252777166881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2075516 + ... + 2610233.

It is an arithmetic number, because the mean of its divisors is an integer number (165819321000).

Almost surely, 2^{1252777166891} is an apocalyptic number.

1252777166891 is a deficient number, since it is larger than the sum of its proper divisors (73777401109).

1252777166891 is a wasteful number, since it uses less digits than its factorization.

1252777166891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4701493.

The product of its digits is 17781120, while the sum is 62.

The spelling of 1252777166891 in words is "one trillion, two hundred fifty-two billion, seven hundred seventy-seven million, one hundred sixty-six thousand, eight hundred ninety-one".