661427654 has 8 divisors (see below), whose sum is σ = 992255880. Its totient is φ = 330675696.

The previous prime is 661427609. The next prime is 661427659. The reversal of 661427654 is 456724166.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661427659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14282 + ... + 39074.

It is an arithmetic number, because the mean of its divisors is an integer number (124031985).

Almost surely, 2^661427654 is an apocalyptic number.

661427654 is a deficient number, since it is larger than the sum of its proper divisors (330828226).

661427654 is a wasteful number, since it uses less digits than its factorization.

661427654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38134.

The product of its digits is 241920, while the sum is 41.

The square root of 661427654 is about 25718.2358259660. The cubic root of 661427654 is about 871.2860945218.

The spelling of 661427654 in words is "six hundred sixty-one million, four hundred twenty-seven thousand, six hundred fifty-four".