279720897965 has 4 divisors (see below), whose sum is σ = 335665077564. Its totient is φ = 223776718368.

The previous prime is 279720897959. The next prime is 279720897991. The reversal of 279720897965 is 569798027972.

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

It can be written as a sum of positive squares in 2 ways, for example, as 172083099241 + 107637798724 = 414829^2 + 328082^2 .

It is a cyclic number.

It is not a de Polignac number, because 279720897965 - 2¹⁴ = 279720881581 is a prime.

It is a super-2 number, since 2×279720897965² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27972089792 + ... + 27972089801.

It is an arithmetic number, because the mean of its divisors is an integer number (83916269391).

Almost surely, 2^279720897965 is an apocalyptic number.

It is an amenable number.

279720897965 is a deficient number, since it is larger than the sum of its proper divisors (55944179599).

279720897965 is an equidigital number, since it uses as much as digits as its factorization.

279720897965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55944179598.

The product of its (nonzero) digits is 240045120, while the sum is 71.

The spelling of 279720897965 in words is "two hundred seventy-nine billion, seven hundred twenty million, eight hundred ninety-seven thousand, nine hundred sixty-five".