611661506 has 4 divisors (see below), whose sum is σ = 917492262. Its totient is φ = 305830752.

The previous prime is 611661503. The next prime is 611661511. The reversal of 611661506 is 605166116.

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., 486423025 + 125238481 = 22055^2 + 11191^2 .

It is not an unprimeable number, because it can be changed into a prime (611661503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152915375 + ... + 152915378.

Almost surely, 2^611661506 is an apocalyptic number.

611661506 is a deficient number, since it is larger than the sum of its proper divisors (305830756).

611661506 is a wasteful number, since it uses less digits than its factorization.

611661506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305830755.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 611661506 is about 24731.7914029696. The cubic root of 611661506 is about 848.8619167838.

The spelling of 611661506 in words is "six hundred eleven million, six hundred sixty-one thousand, five hundred six".