1661763450 has 24 divisors (see below), whose sum is σ = 4121173728. Its totient is φ = 443136880.

The previous prime is 1661763419. The next prime is 1661763457. The reversal of 1661763450 is 543671661.

It is a super-2 number, since 2×1661763450² = 5522915527511805000, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1661763399 and 1661763408.

It is not an unprimeable number, because it can be changed into a prime (1661763457) 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, 5539062 + ... + 5539361.

It is an arithmetic number, because the mean of its divisors is an integer number (171715572).

Almost surely, 2^1661763450 is an apocalyptic number.

1661763450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661763450 is an abundant number, since it is smaller than the sum of its proper divisors (2459410278).

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

1661763450 is a wasteful number, since it uses less digits than its factorization.

1661763450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11078438 (or 11078433 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 1661763450 is about 40764.7329195225. The cubic root of 1661763450 is about 1184.4672782184.

The spelling of 1661763450 in words is "one billion, six hundred sixty-one million, seven hundred sixty-three thousand, four hundred fifty".