1661512453 has 8 divisors (see below), whose sum is σ = 1680013440. Its totient is φ = 1643105280.

The previous prime is 1661512441. The next prime is 1661512469. The reversal of 1661512453 is 3542151661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1661512453 - 2⁵ = 1661512421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661512553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12468 + ... + 58978.

It is an arithmetic number, because the mean of its divisors is an integer number (210001680).

Almost surely, 2^1661512453 is an apocalyptic number.

It is an amenable number.

1661512453 is a deficient number, since it is larger than the sum of its proper divisors (18500987).

1661512453 is a wasteful number, since it uses less digits than its factorization.

1661512453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46907.

The product of its digits is 21600, while the sum is 34.

The square root of 1661512453 is about 40761.6541985234. The cubic root of 1661512453 is about 1184.4076402271.

The spelling of 1661512453 in words is "one billion, six hundred sixty-one million, five hundred twelve thousand, four hundred fifty-three".