7611661251 has 12 divisors (see below), whose sum is σ = 10997779728. Its totient is φ = 5072983344.

The previous prime is 7611661249. The next prime is 7611661273. The reversal of 7611661251 is 1521661167.

It is a happy number.

It is not a de Polignac number, because 7611661251 - 2¹ = 7611661249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7611661151) 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, 87895 + ... + 151488.

It is an arithmetic number, because the mean of its divisors is an integer number (916481644).

Almost surely, 2^7611661251 is an apocalyptic number.

7611661251 is a deficient number, since it is larger than the sum of its proper divisors (3386118477).

7611661251 is a wasteful number, since it uses less digits than its factorization.

7611661251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242922 (or 242919 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 7611661251 is about 87244.8350964113. The cubic root of 7611661251 is about 1967.1002069432.

The spelling of 7611661251 in words is "seven billion, six hundred eleven million, six hundred sixty-one thousand, two hundred fifty-one".