961477980977 has 4 divisors (see below), whose sum is σ = 962223892260. Its totient is φ = 960732069696.

The previous prime is 961477980889. The next prime is 961477980979. The reversal of 961477980977 is 779089774169.

It is a happy number.

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 775991857216 + 185486123761 = 880904^2 + 430681^2 .

It is a cyclic number.

It is not a de Polignac number, because 961477980977 - 2²⁶ = 961410872113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (961477980979) 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, 372953708 + ... + 372956285.

It is an arithmetic number, because the mean of its divisors is an integer number (240555973065).

Almost surely, 2^961477980977 is an apocalyptic number.

It is an amenable number.

961477980977 is a deficient number, since it is larger than the sum of its proper divisors (745911283).

961477980977 is a wasteful number, since it uses less digits than its factorization.

961477980977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745911282.

The product of its (nonzero) digits is 336063168, while the sum is 74.

The spelling of 961477980977 in words is "nine hundred sixty-one billion, four hundred seventy-seven million, nine hundred eighty thousand, nine hundred seventy-seven".