1662501457 has 2 divisors, whose sum is σ = 1662501458. Its totient is φ = 1662501456.

The previous prime is 1662501431. The next prime is 1662501461. The reversal of 1662501457 is 7541052661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1267644816 + 394856641 = 35604^2 + 19871^2 .

It is a cyclic number.

It is not a de Polignac number, because 1662501457 - 2¹⁹ = 1661977169 is a prime.

It is a super-2 number, since 2×1662501457² = 5527822189054245698, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1662501857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831250728 + 831250729.

It is an arithmetic number, because the mean of its divisors is an integer number (831250729).

Almost surely, 2^1662501457 is an apocalyptic number.

It is an amenable number.

1662501457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1662501457 is an equidigital number, since it uses as much as digits as its factorization.

1662501457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50400, while the sum is 37.

The square root of 1662501457 is about 40773.7839426267. The cubic root of 1662501457 is about 1184.6425971482.

The spelling of 1662501457 in words is "one billion, six hundred sixty-two million, five hundred one thousand, four hundred fifty-seven".