61401666 has 32 divisors (see below), whose sum is σ = 125737920. Its totient is φ = 19982144.

The previous prime is 61401653. The next prime is 61401689. The reversal of 61401666 is 66610416.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92845 + ... + 93503.

It is an arithmetic number, because the mean of its divisors is an integer number (3929310).

Almost surely, 2^61401666 is an apocalyptic number.

61401666 is an abundant number, since it is smaller than the sum of its proper divisors (64336254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61401666 is a wasteful number, since it uses less digits than its factorization.

61401666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 61401666 is about 7835.9215156866. The cubic root of 61401666 is about 394.5118490436.

The spelling of 61401666 in words is "sixty-one million, four hundred one thousand, six hundred sixty-six".