1661030390 has 48 divisors (see below), whose sum is σ = 3285759600. Its totient is φ = 603735552.

The previous prime is 1661030377. The next prime is 1661030447. The reversal of 1661030390 is 930301661.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 73901 + ... + 93719.

It is an arithmetic number, because the mean of its divisors is an integer number (68453325).

Almost surely, 2^1661030390 is an apocalyptic number.

1661030390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661030390 is a deficient number, since it is larger than the sum of its proper divisors (1624729210).

1661030390 is a wasteful number, since it uses less digits than its factorization.

1661030390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19889 (or 19872 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 1661030390 is about 40755.7405772487. The cubic root of 1661030390 is about 1184.2930830904.

The spelling of 1661030390 in words is "one billion, six hundred sixty-one million, thirty thousand, three hundred ninety".