1661456156 has 6 divisors (see below), whose sum is σ = 2907548280. Its totient is φ = 830728076.

The previous prime is 1661456141. The next prime is 1661456179. The reversal of 1661456156 is 6516541661.

It is a super-3 number, since 3×1661456156³ (a number of 29 digits) contains 333 as substring.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 207682016 + ... + 207682023.

It is an arithmetic number, because the mean of its divisors is an integer number (484591380).

Almost surely, 2^1661456156 is an apocalyptic number.

It is an amenable number.

1661456156 is a deficient number, since it is larger than the sum of its proper divisors (1246092124).

1661456156 is a wasteful number, since it uses less digits than its factorization.

1661456156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415364043 (or 415364041 counting only the distinct ones).

The product of its digits is 129600, while the sum is 41.

The square root of 1661456156 is about 40760.9636294335. The cubic root of 1661456156 is about 1184.3942629876.

The spelling of 1661456156 in words is "one billion, six hundred sixty-one million, four hundred fifty-six thousand, one hundred fifty-six".