6690736261 has 12 divisors (see below), whose sum is σ = 7474850572. Its totient is φ = 5982768000.

The previous prime is 6690736253. The next prime is 6690736279. The reversal of 6690736261 is 1626370966.

It can be written as a sum of positive squares in 2 ways, for example, as 3134880100 + 3555856161 = 55990^2 + 59631^2 .

It is not a de Polignac number, because 6690736261 - 2³ = 6690736253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6690736561) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 445860 + ... + 460621.

Almost surely, 2^6690736261 is an apocalyptic number.

6690736261 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

6690736261 is a deficient number, since it is larger than the sum of its proper divisors (784114311).

6690736261 is a wasteful number, since it uses less digits than its factorization.

6690736261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906564 (or 906553 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 46.

The square root of 6690736261 is about 81796.9208528047. The cubic root of 6690736261 is about 1884.3343728391.

The spelling of 6690736261 in words is "six billion, six hundred ninety million, seven hundred thirty-six thousand, two hundred sixty-one".