2661915951 has 12 divisors (see below), whose sum is σ = 3849365520. Its totient is φ = 1772591040.

The previous prime is 2661915943. The next prime is 2661915953. The reversal of 2661915951 is 1595191662.

It is a happy number.

2661915951 is a `hidden beast` number, since 26 + 619 + 1 + 5 + 9 + 5 + 1 = 666.

It is not a de Polignac number, because 2661915951 - 2³ = 2661915943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2661915897 and 2661915906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661915953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 159931 + ... + 175788.

It is an arithmetic number, because the mean of its divisors is an integer number (320780460).

Almost surely, 2^2661915951 is an apocalyptic number.

2661915951 is a deficient number, since it is larger than the sum of its proper divisors (1187449569).

2661915951 is a wasteful number, since it uses less digits than its factorization.

2661915951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336606 (or 336603 counting only the distinct ones).

The product of its digits is 145800, while the sum is 45.

The square root of 2661915951 is about 51593.7588376734. The cubic root of 2661915951 is about 1385.8985686283.

The spelling of 2661915951 in words is "two billion, six hundred sixty-one million, nine hundred fifteen thousand, nine hundred fifty-one".