661012354 has 8 divisors (see below), whose sum is σ = 993238668. Its totient is φ = 329932800.

The previous prime is 661012351. The next prime is 661012361. The reversal of 661012354 is 453210166.

It can be written as a sum of positive squares in 2 ways, for example, as 655616025 + 5396329 = 25605^2 + 2323^2 .

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

It is not an unprimeable number, because it can be changed into a prime (661012351) 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, 285247 + ... + 287554.

Almost surely, 2^661012354 is an apocalyptic number.

661012354 is a deficient number, since it is larger than the sum of its proper divisors (332226314).

661012354 is a wasteful number, since it uses less digits than its factorization.

661012354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573380.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 661012354 is about 25710.1605206969. The cubic root of 661012354 is about 871.1037007399.

The spelling of 661012354 in words is "six hundred sixty-one million, twelve thousand, three hundred fifty-four".