5661089978 has 4 divisors (see below), whose sum is σ = 8491634970. Its totient is φ = 2830544988.

The previous prime is 5661089969. The next prime is 5661089983. The reversal of 5661089978 is 8799801665.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 5583526729 + 77563249 = 74723^2 + 8807^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1415272493 + ... + 1415272496.

Almost surely, 2^5661089978 is an apocalyptic number.

5661089978 is a deficient number, since it is larger than the sum of its proper divisors (2830544992).

5661089978 is a wasteful number, since it uses less digits than its factorization.

5661089978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2830544991.

The product of its (nonzero) digits is 6531840, while the sum is 59.

The square root of 5661089978 is about 75240.2151644983. The cubic root of 5661089978 is about 1782.2420489528.

The spelling of 5661089978 in words is "five billion, six hundred sixty-one million, eighty-nine thousand, nine hundred seventy-eight".