1252577661 has 8 divisors (see below), whose sum is σ = 1723977984. Its totient is φ = 808114560.

The previous prime is 1252577653. The next prime is 1252577671. The reversal of 1252577661 is 1667752521.

It is a happy number.

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

It is not a de Polignac number, because 1252577661 - 2³ = 1252577653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1252577671) 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, 6734196 + ... + 6734381.

It is an arithmetic number, because the mean of its divisors is an integer number (215497248).

Almost surely, 2^1252577661 is an apocalyptic number.

It is an amenable number.

1252577661 is a deficient number, since it is larger than the sum of its proper divisors (471400323).

1252577661 is a wasteful number, since it uses less digits than its factorization.

1252577661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13468611.

The product of its digits is 176400, while the sum is 42.

The square root of 1252577661 is about 35391.7739171124. The cubic root of 1252577661 is about 1077.9572902650.

The spelling of 1252577661 in words is "one billion, two hundred fifty-two million, five hundred seventy-seven thousand, six hundred sixty-one".