757249194921 has 4 divisors (see below), whose sum is σ = 1009665593232. Its totient is φ = 504832796612.

The previous prime is 757249194883. The next prime is 757249194937. The reversal of 757249194921 is 129491942757.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 129491942757 = 3 ⋅43163980919.

It is a cyclic number.

It is not a de Polignac number, because 757249194921 - 2⁶ = 757249194857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (757249195921) 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, 126208199151 + ... + 126208199156.

It is an arithmetic number, because the mean of its divisors is an integer number (252416398308).

Almost surely, 2^757249194921 is an apocalyptic number.

It is an amenable number.

757249194921 is a deficient number, since it is larger than the sum of its proper divisors (252416398311).

757249194921 is a wasteful number, since it uses less digits than its factorization.

757249194921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252416398310.

The product of its digits is 11430720, while the sum is 60.

The spelling of 757249194921 in words is "seven hundred fifty-seven billion, two hundred forty-nine million, one hundred ninety-four thousand, nine hundred twenty-one".