16620051 has 8 divisors (see below), whose sum is σ = 25325824. Its totient is φ = 9497160.

The previous prime is 16620049. The next prime is 16620119. The reversal of 16620051 is 15002661.

It is a happy number.

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

It is not a de Polignac number, because 16620051 - 2¹ = 16620049 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 791431 = 16620051 / (1 + 6 + 6 + 2 + 0 + 0 + 5 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16620001) 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, 395695 + ... + 395736.

It is an arithmetic number, because the mean of its divisors is an integer number (3165728).

Almost surely, 2^16620051 is an apocalyptic number.

16620051 is a deficient number, since it is larger than the sum of its proper divisors (8705773).

16620051 is an equidigital number, since it uses as much as digits as its factorization.

16620051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791441.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 16620051 is about 4076.7696770850. The cubic root of 16620051 is about 255.1981082576.

The spelling of 16620051 in words is "sixteen million, six hundred twenty thousand, fifty-one".