7877941961 has 4 divisors (see below), whose sum is σ = 7878128532. Its totient is φ = 7877755392.

The previous prime is 7877941927. The next prime is 7877941969. The reversal of 7877941961 is 1691497787.

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 4222530361 + 3655411600 = 64981^2 + 60460^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7877941961 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7877941961.

It is not an unprimeable number, because it can be changed into a prime (7877941969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3581 + ... + 125573.

It is an arithmetic number, because the mean of its divisors is an integer number (1969532133).

Almost surely, 2^7877941961 is an apocalyptic number.

It is an amenable number.

7877941961 is a deficient number, since it is larger than the sum of its proper divisors (186571).

7877941961 is a wasteful number, since it uses less digits than its factorization.

7877941961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186570.

The product of its digits is 5334336, while the sum is 59.

The square root of 7877941961 is about 88757.7712710273. The cubic root of 7877941961 is about 1989.7763240260.

The spelling of 7877941961 in words is "seven billion, eight hundred seventy-seven million, nine hundred forty-one thousand, nine hundred sixty-one".