611620643 has 4 divisors (see below), whose sum is σ = 632711040. Its totient is φ = 590530248.

The previous prime is 611620637. The next prime is 611620663. The reversal of 611620643 is 346026116.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 611620643 - 2⁴ = 611620627 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 21090367 = 611620643 / (6 + 1 + 1 + 6 + 2 + 0 + 6 + 4 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (611620663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10545155 + ... + 10545212.

It is an arithmetic number, because the mean of its divisors is an integer number (158177760).

Almost surely, 2^611620643 is an apocalyptic number.

611620643 is a deficient number, since it is larger than the sum of its proper divisors (21090397).

611620643 is a wasteful number, since it uses less digits than its factorization.

611620643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21090396.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 611620643 is about 24730.9652662406. The cubic root of 611620643 is about 848.8430131818.

Adding to 611620643 its reverse (346026116), we get a palindrome (957646759).

The spelling of 611620643 in words is "six hundred eleven million, six hundred twenty thousand, six hundred forty-three".