1661718754 has 12 divisors (see below), whose sum is σ = 2639577942. Its totient is φ = 781873440.

The previous prime is 1661718727. The next prime is 1661718767. The reversal of 1661718754 is 4578171661.

It can be written as a sum of positive squares in only one way, i.e., 1221852025 + 439866729 = 34955^2 + 20973^2 .

It is a super-2 number, since 2×1661718754² = 5522618434790625032, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 234199 + ... + 241189.

Almost surely, 2^1661718754 is an apocalyptic number.

1661718754 is a deficient number, since it is larger than the sum of its proper divisors (977859188).

1661718754 is an frugal number, since it uses more digits than its factorization.

1661718754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14001 (or 7010 counting only the distinct ones).

The product of its digits is 282240, while the sum is 46.

The square root of 1661718754 is about 40764.1846968635. The cubic root of 1661718754 is about 1184.4566586917.

The spelling of 1661718754 in words is "one billion, six hundred sixty-one million, seven hundred eighteen thousand, seven hundred fifty-four".