76545561 has 4 divisors (see below), whose sum is σ = 102060752. Its totient is φ = 51030372.

The previous prime is 76545559. The next prime is 76545571. The reversal of 76545561 is 16554567.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 76545561 - 2¹ = 76545559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76545551) 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, 12757591 + ... + 12757596.

It is an arithmetic number, because the mean of its divisors is an integer number (25515188).

Almost surely, 2^76545561 is an apocalyptic number.

It is an amenable number.

76545561 is a deficient number, since it is larger than the sum of its proper divisors (25515191).

76545561 is a wasteful number, since it uses less digits than its factorization.

76545561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25515190.

The product of its digits is 126000, while the sum is 39.

The square root of 76545561 is about 8749.0320035990. The cubic root of 76545561 is about 424.5934955085.

The spelling of 76545561 in words is "seventy-six million, five hundred forty-five thousand, five hundred sixty-one".