7780161491 has 4 divisors (see below), whose sum is σ = 7907705184. Its totient is φ = 7652617800.

The previous prime is 7780161463. The next prime is 7780161541. The reversal of 7780161491 is 1941610877.

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

It is a cyclic number.

It is not a de Polignac number, because 7780161491 - 2²² = 7775967187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7780161451) 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, 63771755 + ... + 63771876.

It is an arithmetic number, because the mean of its divisors is an integer number (1976926296).

Almost surely, 2^7780161491 is an apocalyptic number.

7780161491 is a deficient number, since it is larger than the sum of its proper divisors (127543693).

7780161491 is a wasteful number, since it uses less digits than its factorization.

7780161491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127543692.

The product of its (nonzero) digits is 84672, while the sum is 44.

The square root of 7780161491 is about 88205.2237171926. The cubic root of 7780161491 is about 1981.5097055612.

The spelling of 7780161491 in words is "seven billion, seven hundred eighty million, one hundred sixty-one thousand, four hundred ninety-one".