1966297553 has 12 divisors (see below), whose sum is σ = 2167240320. Its totient is φ = 1782632280.

The previous prime is 1966297523. The next prime is 1966297561. The reversal of 1966297553 is 3557926691.

It is not a de Polignac number, because 1966297553 - 2²² = 1962103249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1966297495 and 1966297504.

It is not an unprimeable number, because it can be changed into a prime (1966297513) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22268 + ... + 66546.

It is an arithmetic number, because the mean of its divisors is an integer number (180603360).

Almost surely, 2^1966297553 is an apocalyptic number.

It is an amenable number.

1966297553 is a deficient number, since it is larger than the sum of its proper divisors (200942767).

1966297553 is a wasteful number, since it uses less digits than its factorization.

1966297553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44668 (or 44657 counting only the distinct ones).

The product of its digits is 3061800, while the sum is 53.

The square root of 1966297553 is about 44342.9538145577. The cubic root of 1966297553 is about 1252.8038506747.

The spelling of 1966297553 in words is "one billion, nine hundred sixty-six million, two hundred ninety-seven thousand, five hundred fifty-three".