16611297690 has 64 divisors (see below), whose sum is σ = 43069574016. Its totient is φ = 4076005632.

The previous prime is 16611297671. The next prime is 16611297709. The reversal of 16611297690 is 9679211661.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (16611297671) and next prime (16611297709).

It is a super-2 number, since 2×16611297690² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56449 + ... + 190811.

It is an arithmetic number, because the mean of its divisors is an integer number (672962094).

Almost surely, 2^16611297690 is an apocalyptic number.

16611297690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 16611297690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21534787008).

16611297690 is an abundant number, since it is smaller than the sum of its proper divisors (26458276326).

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

16611297690 is a wasteful number, since it uses less digits than its factorization.

16611297690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134703.

The product of its (nonzero) digits is 244944, while the sum is 48.

The spelling of 16611297690 in words is "sixteen billion, six hundred eleven million, two hundred ninety-seven thousand, six hundred ninety".