1545984661 has 8 divisors (see below), whose sum is σ = 1668109464. Its totient is φ = 1424317440.

The previous prime is 1545984637. The next prime is 1545984667. The reversal of 1545984661 is 1664895451.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 227859025 + 1318125636 = 15095^2 + 36306^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-1545984661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1545984667) 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, 107356 + ... + 120901.

It is an arithmetic number, because the mean of its divisors is an integer number (208513683).

Almost surely, 2^1545984661 is an apocalyptic number.

It is an amenable number.

1545984661 is a deficient number, since it is larger than the sum of its proper divisors (122124803).

1545984661 is a wasteful number, since it uses less digits than its factorization.

1545984661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228791.

The product of its digits is 1036800, while the sum is 49.

The square root of 1545984661 is about 39319.0114448469. The cubic root of 1545984661 is about 1156.2943233226.

The spelling of 1545984661 in words is "one billion, five hundred forty-five million, nine hundred eighty-four thousand, six hundred sixty-one".