2851137661 has 12 divisors (see below), whose sum is σ = 3045943008. Its totient is φ = 2663712744.

The previous prime is 2851137649. The next prime is 2851137719. The reversal of 2851137661 is 1667311582.

It is a happy number.

It is not a de Polignac number, because 2851137661 - 2⁵ = 2851137629 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 (2851137061) 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, 9006 + ... + 76048.

It is an arithmetic number, because the mean of its divisors is an integer number (253828584).

Almost surely, 2^2851137661 is an apocalyptic number.

It is an amenable number.

2851137661 is a deficient number, since it is larger than the sum of its proper divisors (194805347).

2851137661 is an equidigital number, since it uses as much as digits as its factorization.

2851137661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67152 (or 67109 counting only the distinct ones).

The product of its digits is 60480, while the sum is 40.

The square root of 2851137661 is about 53396.0453685477. The cubic root of 2851137661 is about 1417.9885660495.

The spelling of 2851137661 in words is "two billion, eight hundred fifty-one million, one hundred thirty-seven thousand, six hundred sixty-one".