1618817801 has 16 divisors (see below), whose sum is σ = 1679302800. Its totient is φ = 1559470080.

The previous prime is 1618817791. The next prime is 1618817831. The reversal of 1618817801 is 1087188161.

It can be written as a sum of positive squares in 8 ways, for example, as 138415225 + 1480402576 = 11765^2 + 38476^2 .

It is a cyclic number.

It is not a de Polignac number, because 1618817801 - 2¹⁴ = 1618801417 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1618817831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1178351 + ... + 1179723.

It is an arithmetic number, because the mean of its divisors is an integer number (104956425).

Almost surely, 2^1618817801 is an apocalyptic number.

It is an amenable number.

1618817801 is a deficient number, since it is larger than the sum of its proper divisors (60484999).

1618817801 is a wasteful number, since it uses less digits than its factorization.

1618817801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1756.

The product of its (nonzero) digits is 21504, while the sum is 41.

The square root of 1618817801 is about 40234.5349295851. The cubic root of 1618817801 is about 1174.1745343958.

The spelling of 1618817801 in words is "one billion, six hundred eighteen million, eight hundred seventeen thousand, eight hundred one".