997647466 has 4 divisors (see below), whose sum is σ = 1496471202. Its totient is φ = 498823732.

The previous prime is 997647463. The next prime is 997647481. The reversal of 997647466 is 664746799.

997647466 = T₂₅₇₈₈ + T₂₅₇₈₉ + T₂₅₇₉₀.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 531994225 + 465653241 = 23065^2 + 21579^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 997647466.

It is not an unprimeable number, because it can be changed into a prime (997647463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249411865 + ... + 249411868.

Almost surely, 2^997647466 is an apocalyptic number.

997647466 is the 25790-th centered triangular number.

997647466 is a deficient number, since it is larger than the sum of its proper divisors (498823736).

997647466 is a wasteful number, since it uses less digits than its factorization.

997647466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498823735.

The product of its digits is 13716864, while the sum is 58.

The square root of 997647466 is about 31585.5578706471. The cubic root of 997647466 is about 999.2152062599.

The spelling of 997647466 in words is "nine hundred ninety-seven million, six hundred forty-seven thousand, four hundred sixty-six".