7977581783 has 16 divisors (see below), whose sum is σ = 8451384480. Its totient is φ = 7518516096.

The previous prime is 7977581771. The next prime is 7977581791. The reversal of 7977581783 is 3871857797.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 7977581783 - 2⁶ = 7977581719 is a prime.

It is a super-2 number, since 2×7977581783² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7977581753) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 289616 + ... + 315962.

It is an arithmetic number, because the mean of its divisors is an integer number (528211530).

Almost surely, 2^7977581783 is an apocalyptic number.

7977581783 is a deficient number, since it is larger than the sum of its proper divisors (473802697).

7977581783 is a wasteful number, since it uses less digits than its factorization.

7977581783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26626.

The product of its digits is 20744640, while the sum is 62.

The square root of 7977581783 is about 89317.3095374015. The cubic root of 7977581783 is about 1998.1300674710.

The spelling of 7977581783 in words is "seven billion, nine hundred seventy-seven million, five hundred eighty-one thousand, seven hundred eighty-three".