42787027961 has 4 divisors (see below), whose sum is σ = 42789377652. Its totient is φ = 42784678272.

The previous prime is 42787027937. The next prime is 42787027967. The reversal of 42787027961 is 16972078724.

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 1712304400 + 41074723561 = 41380^2 + 202669^2 .

It is a cyclic number.

It is not a de Polignac number, because 42787027961 - 2²² = 42782833657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42787027967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1147316 + ... + 1184021.

It is an arithmetic number, because the mean of its divisors is an integer number (10697344413).

Almost surely, 2^42787027961 is an apocalyptic number.

It is an amenable number.

42787027961 is a deficient number, since it is larger than the sum of its proper divisors (2349691).

42787027961 is a wasteful number, since it uses less digits than its factorization.

42787027961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2349690.

The product of its (nonzero) digits is 2370816, while the sum is 53.

The spelling of 42787027961 in words is "forty-two billion, seven hundred eighty-seven million, twenty-seven thousand, nine hundred sixty-one".