2677545661 has 6 divisors (see below), whose sum is σ = 3114696030. Its totient is φ = 2295039096.

The previous prime is 2677545641. The next prime is 2677545691. The reversal of 2677545661 is 1665457762.

It can be written as a sum of positive squares in only one way, i.e., 2452725625 + 224820036 = 49525^2 + 14994^2 .

It is not a de Polignac number, because 2677545661 - 2²⁹ = 2140674749 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 54643789 = 2677545661 / (2 + 6 + 7 + 7 + 5 + 4 + 5 + 6 + 6 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2677545601) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27321846 + ... + 27321943.

It is an arithmetic number, because the mean of its divisors is an integer number (519116005).

Almost surely, 2^2677545661 is an apocalyptic number.

It is an amenable number.

2677545661 is a deficient number, since it is larger than the sum of its proper divisors (437150369).

2677545661 is an equidigital number, since it uses as much as digits as its factorization.

2677545661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54643803 (or 54643796 counting only the distinct ones).

The product of its digits is 2116800, while the sum is 49.

The square root of 2677545661 is about 51745.0061455209. The cubic root of 2677545661 is about 1388.6057584334.

The spelling of 2677545661 in words is "two billion, six hundred seventy-seven million, five hundred forty-five thousand, six hundred sixty-one".