6161666021 has 8 divisors (see below), whose sum is σ = 7050405120. Its totient is φ = 5275052208.

The previous prime is 6161665973. The next prime is 6161666023. The reversal of 6161666021 is 1206661616.

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 6161666021 - 2⁶ = 6161665957 is a prime.

It is a super-2 number, since 2×6161666021² = 75932256308691944882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6161666023) 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, 525101 + ... + 536706.

It is an arithmetic number, because the mean of its divisors is an integer number (881300640).

Almost surely, 2^6161666021 is an apocalyptic number.

It is an amenable number.

6161666021 is a deficient number, since it is larger than the sum of its proper divisors (888739099).

6161666021 is a wasteful number, since it uses less digits than its factorization.

6161666021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1062643.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 6161666021 is about 78496.2803004066. The cubic root of 6161666021 is about 1833.2965376160.

The spelling of 6161666021 in words is "six billion, one hundred sixty-one million, six hundred sixty-six thousand, twenty-one".