1643420577 has 32 divisors (see below), whose sum is σ = 2296053760. Its totient is φ = 1044394560.

The previous prime is 1643420567. The next prime is 1643420609. The reversal of 1643420577 is 7750243461.

It is not a de Polignac number, because 1643420577 - 2¹⁰ = 1643419553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1643420557) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2260188 + ... + 2260914.

It is an arithmetic number, because the mean of its divisors is an integer number (71751680).

Almost surely, 2^1643420577 is an apocalyptic number.

It is an amenable number.

1643420577 is a deficient number, since it is larger than the sum of its proper divisors (652633183).

1643420577 is a wasteful number, since it uses less digits than its factorization.

1643420577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093.

The product of its (nonzero) digits is 141120, while the sum is 39.

The square root of 1643420577 is about 40539.1240285234. The cubic root of 1643420577 is about 1180.0930159847.

The spelling of 1643420577 in words is "one billion, six hundred forty-three million, four hundred twenty thousand, five hundred seventy-seven".