661498354 has 16 divisors (see below), whose sum is σ = 1129515840. Its totient is φ = 287607760.

The previous prime is 661498309. The next prime is 661498379. The reversal of 661498354 is 453894166.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 653149 + ... + 654160.

It is an arithmetic number, because the mean of its divisors is an integer number (70594740).

Almost surely, 2^661498354 is an apocalyptic number.

661498354 is a deficient number, since it is larger than the sum of its proper divisors (468017486).

661498354 is a wasteful number, since it uses less digits than its factorization.

661498354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1307345.

The product of its digits is 622080, while the sum is 46.

The square root of 661498354 is about 25719.6103003136. The cubic root of 661498354 is about 871.3171373385.

The spelling of 661498354 in words is "six hundred sixty-one million, four hundred ninety-eight thousand, three hundred fifty-four".