1997566416 has 30 divisors (see below), whose sum is σ = 5590411970. Its totient is φ = 665855424.

The previous prime is 1997566393. The next prime is 1997566423. The reversal of 1997566416 is 6146657991.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1539777600 + 457788816 = 39240^2 + 21396^2 .

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, 6935851 + ... + 6936138.

Almost surely, 2^1997566416 is an apocalyptic number.

1997566416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1997566416 is an abundant number, since it is smaller than the sum of its proper divisors (3592845554).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1997566416 is a wasteful number, since it uses less digits than its factorization.

1997566416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13872003 (or 13871994 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 54.

The square root of 1997566416 is about 44694.1429719824. The cubic root of 1997566416 is about 1259.4098218680.

The spelling of 1997566416 in words is "one billion, nine hundred ninety-seven million, five hundred sixty-six thousand, four hundred sixteen".