1661420535 has 16 divisors (see below), whose sum is σ = 2675880960. Its totient is φ = 880221600.

The previous prime is 1661420483. The next prime is 1661420549. The reversal of 1661420535 is 5350241661.

It is not a de Polignac number, because 1661420535 - 2⁹ = 1661420023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1661420496 and 1661420505.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 364495 + ... + 369024.

It is an arithmetic number, because the mean of its divisors is an integer number (167242560).

Almost surely, 2^1661420535 is an apocalyptic number.

1661420535 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1661420535 is a deficient number, since it is larger than the sum of its proper divisors (1014460425).

1661420535 is a wasteful number, since it uses less digits than its factorization.

1661420535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 733678.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 1661420535 is about 40760.5266771665. The cubic root of 1661420535 is about 1184.3857986034.

The spelling of 1661420535 in words is "one billion, six hundred sixty-one million, four hundred twenty thousand, five hundred thirty-five".