74156661 has 8 divisors (see below), whose sum is σ = 109861760. Its totient is φ = 49437756.

The previous prime is 74156653. The next prime is 74156689. The reversal of 74156661 is 16665147.

It is not a de Polignac number, because 74156661 - 2³ = 74156653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74156651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1373245 + ... + 1373298.

It is an arithmetic number, because the mean of its divisors is an integer number (13732720).

Almost surely, 2^74156661 is an apocalyptic number.

It is an amenable number.

74156661 is a deficient number, since it is larger than the sum of its proper divisors (35705099).

74156661 is a wasteful number, since it uses less digits than its factorization.

74156661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2746552 (or 2746546 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 74156661 is about 8611.4261885010. The cubic root of 74156661 is about 420.1297048383.

The spelling of 74156661 in words is "seventy-four million, one hundred fifty-six thousand, six hundred sixty-one".