661452250161 has 8 divisors (see below), whose sum is σ = 883083197920. Its totient is φ = 440394734592.

The previous prime is 661452250159. The next prime is 661452250163. The reversal of 661452250161 is 161052254166.

It is an interprime number because it is at equal distance from previous prime (661452250159) and next prime (661452250163).

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

It is not a de Polignac number, because 661452250161 - 2¹ = 661452250159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661452250163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143355355 + ... + 143359968.

It is an arithmetic number, because the mean of its divisors is an integer number (110385399740).

Almost surely, 2^661452250161 is an apocalyptic number.

It is an amenable number.

661452250161 is a deficient number, since it is larger than the sum of its proper divisors (221630947759).

661452250161 is a wasteful number, since it uses less digits than its factorization.

661452250161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286716095.

The product of its (nonzero) digits is 86400, while the sum is 39.

The spelling of 661452250161 in words is "six hundred sixty-one billion, four hundred fifty-two million, two hundred fifty thousand, one hundred sixty-one".