75618457661 has 4 divisors (see below), whose sum is σ = 75744279324. Its totient is φ = 75492636000.

The previous prime is 75618457657. The next prime is 75618457679. The reversal of 75618457661 is 16675481657.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16675481657 = 43 ⋅387801899.

It can be written as a sum of positive squares in 2 ways, for example, as 56734476100 + 18883981561 = 238190^2 + 137419^2 .

It is a cyclic number.

It is not a de Polignac number, because 75618457661 - 2² = 75618457657 is a prime.

It is a super-2 number, since 2×75618457661² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 75618457597 and 75618457606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75618457631) 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, 62909930 + ... + 62911131.

It is an arithmetic number, because the mean of its divisors is an integer number (18936069831).

Almost surely, 2^75618457661 is an apocalyptic number.

It is an amenable number.

75618457661 is a deficient number, since it is larger than the sum of its proper divisors (125821663).

75618457661 is a wasteful number, since it uses less digits than its factorization.

75618457661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125821662.

The product of its digits is 8467200, while the sum is 56.

The spelling of 75618457661 in words is "seventy-five billion, six hundred eighteen million, four hundred fifty-seven thousand, six hundred sixty-one".