75915979209 has 24 divisors (see below), whose sum is σ = 128378245632. Its totient is φ = 42322495680.

The previous prime is 75915979201. The next prime is 75915979301. The reversal of 75915979209 is 90297951957.

It is not a de Polignac number, because 75915979209 - 2³ = 75915979201 is a prime.

It is a super-2 number, since 2×75915979209² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (75915979201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14692729 + ... + 14697894.

It is an arithmetic number, because the mean of its divisors is an integer number (5349093568).

Almost surely, 2^75915979209 is an apocalyptic number.

It is an amenable number.

75915979209 is a deficient number, since it is larger than the sum of its proper divisors (52462266423).

75915979209 is a wasteful number, since it uses less digits than its factorization.

75915979209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29390677 (or 29390674 counting only the distinct ones).

The product of its (nonzero) digits is 16074450, while the sum is 63.

The spelling of 75915979209 in words is "seventy-five billion, nine hundred fifteen million, nine hundred seventy-nine thousand, two hundred nine".