75309899947 has 4 divisors (see below), whose sum is σ = 75334848280. Its totient is φ = 75284951616.

The previous prime is 75309899843. The next prime is 75309899969. The reversal of 75309899947 is 74999890357.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75309899947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75319899947) 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, 12469638 + ... + 12475675.

It is an arithmetic number, because the mean of its divisors is an integer number (18833712070).

Almost surely, 2^75309899947 is an apocalyptic number.

75309899947 is a deficient number, since it is larger than the sum of its proper divisors (24948333).

75309899947 is a wasteful number, since it uses less digits than its factorization.

75309899947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24948332.

The product of its (nonzero) digits is 154314720, while the sum is 70.

The spelling of 75309899947 in words is "seventy-five billion, three hundred nine million, eight hundred ninety-nine thousand, nine hundred forty-seven".