661612654 has 8 divisors (see below), whose sum is σ = 1016624448. Its totient is φ = 322737840.

The previous prime is 661612643. The next prime is 661612667. The reversal of 661612654 is 456216166.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4034142 + ... + 4034305.

It is an arithmetic number, because the mean of its divisors is an integer number (127078056).

Almost surely, 2^661612654 is an apocalyptic number.

661612654 is a deficient number, since it is larger than the sum of its proper divisors (355011794).

661612654 is a wasteful number, since it uses less digits than its factorization.

661612654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8068490.

The product of its digits is 51840, while the sum is 37.

The square root of 661612654 is about 25721.8322442240. The cubic root of 661612654 is about 871.3673192790.

It can be divided in two parts, 661612 and 654, that added together give a palindrome (662266).

The spelling of 661612654 in words is "six hundred sixty-one million, six hundred twelve thousand, six hundred fifty-four".