1966498257 has 16 divisors (see below), whose sum is σ = 2658656000. Its totient is φ = 1292713344.

The previous prime is 1966498253. The next prime is 1966498277. The reversal of 1966498257 is 7528946691.

It is not a de Polignac number, because 1966498257 - 2² = 1966498253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1966498197 and 1966498206.

It is not an unprimeable number, because it can be changed into a prime (1966498253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 191469 + ... + 201477.

It is an arithmetic number, because the mean of its divisors is an integer number (166166000).

Almost surely, 2^1966498257 is an apocalyptic number.

It is an amenable number.

1966498257 is a deficient number, since it is larger than the sum of its proper divisors (692157743).

1966498257 is a wasteful number, since it uses less digits than its factorization.

1966498257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10920.

The product of its digits is 6531840, while the sum is 57.

The square root of 1966498257 is about 44345.2168446609. The cubic root of 1966498257 is about 1252.8464746389.

The spelling of 1966498257 in words is "one billion, nine hundred sixty-six million, four hundred ninety-eight thousand, two hundred fifty-seven".