611661501 has 12 divisors (see below), whose sum is σ = 963830400. Its totient is φ = 370703880.

The previous prime is 611661497. The next prime is 611661503. The reversal of 611661501 is 105166116.

It is not a de Polignac number, because 611661501 - 2² = 611661497 is a prime.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3089101 + ... + 3089298.

It is an arithmetic number, because the mean of its divisors is an integer number (80319200).

Almost surely, 2^611661501 is an apocalyptic number.

It is an amenable number.

611661501 is a deficient number, since it is larger than the sum of its proper divisors (352168899).

611661501 is a wasteful number, since it uses less digits than its factorization.

611661501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6178416 (or 6178413 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 611661501 is about 24731.7913018851. The cubic root of 611661501 is about 848.8619144708.

The spelling of 611661501 in words is "six hundred eleven million, six hundred sixty-one thousand, five hundred one".