2651451965 has 4 divisors (see below), whose sum is σ = 3181742364. Its totient is φ = 2121161568.

The previous prime is 2651451961. The next prime is 2651451977. The reversal of 2651451965 is 5691541562.

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 2042497636 + 608954329 = 45194^2 + 24677^2 .

It is a cyclic number.

It is not a de Polignac number, because 2651451965 - 2² = 2651451961 is a prime.

It is a super-2 number, since 2×2651451965² = 14060395045404722450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2651451961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265145192 + ... + 265145201.

It is an arithmetic number, because the mean of its divisors is an integer number (795435591).

Almost surely, 2^2651451965 is an apocalyptic number.

It is an amenable number.

2651451965 is a deficient number, since it is larger than the sum of its proper divisors (530290399).

2651451965 is an equidigital number, since it uses as much as digits as its factorization.

2651451965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530290398.

The product of its digits is 324000, while the sum is 44.

The square root of 2651451965 is about 51492.2515044740. The cubic root of 2651451965 is about 1384.0801957509.

The spelling of 2651451965 in words is "two billion, six hundred fifty-one million, four hundred fifty-one thousand, nine hundred sixty-five".