661403334462146 has 4 divisors (see below), whose sum is σ = 992105001693222. Its totient is φ = 330701667231072.

The previous prime is 661403334462137. The next prime is 661403334462149. The reversal of 661403334462146 is 641264433304166.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 543642617661025 + 117760716801121 = 23316145^2 + 10851761^2 .

It is not an unprimeable number, because it can be changed into a prime (661403334462149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165350833615535 + ... + 165350833615538.

Almost surely, 2^{661403334462146} is an apocalyptic number.

661403334462146 is a deficient number, since it is larger than the sum of its proper divisors (330701667231076).

661403334462146 is a wasteful number, since it uses less digits than its factorization.

661403334462146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330701667231075.

The product of its (nonzero) digits is 17915904, while the sum is 53.

The spelling of 661403334462146 in words is "six hundred sixty-one trillion, four hundred three billion, three hundred thirty-four million, four hundred sixty-two thousand, one hundred forty-six".