1643455070 has 16 divisors (see below), whose sum is σ = 3030371568. Its totient is φ = 641348160.

The previous prime is 1643455061. The next prime is 1643455081. The reversal of 1643455070 is 705543461.

It is a self number, because there is not a number n which added to its sum of digits gives 1643455070.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2003804 + ... + 2004623.

It is an arithmetic number, because the mean of its divisors is an integer number (189398223).

Almost surely, 2^1643455070 is an apocalyptic number.

1643455070 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1643455070 is a deficient number, since it is larger than the sum of its proper divisors (1386916498).

1643455070 is a wasteful number, since it uses less digits than its factorization.

1643455070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4008475.

The product of its (nonzero) digits is 50400, while the sum is 35.

The square root of 1643455070 is about 40539.5494548225. The cubic root of 1643455070 is about 1180.1012720704.

The spelling of 1643455070 in words is "one billion, six hundred forty-three million, four hundred fifty-five thousand, seventy".