749287373561 has 4 divisors (see below), whose sum is σ = 749664470352. Its totient is φ = 748910276772.

The previous prime is 749287373509. The next prime is 749287373573. The reversal of 749287373561 is 165373782947.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 749287373561 - 2³⁴ = 732107504377 is a prime.

It is a super-2 number, since 2×749287373561² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 749287373494 and 749287373503.

It is not an unprimeable number, because it can be changed into a prime (749287373591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188545415 + ... + 188549388.

It is an arithmetic number, because the mean of its divisors is an integer number (187416117588).

Almost surely, 2^749287373561 is an apocalyptic number.

It is an amenable number.

749287373561 is a deficient number, since it is larger than the sum of its proper divisors (377096791).

749287373561 is a wasteful number, since it uses less digits than its factorization.

749287373561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377096790.

The product of its digits is 53343360, while the sum is 62.

The spelling of 749287373561 in words is "seven hundred forty-nine billion, two hundred eighty-seven million, three hundred seventy-three thousand, five hundred sixty-one".