1661254536 has 32 divisors (see below), whose sum is σ = 4287110400. Its totient is φ = 535888320.

The previous prime is 1661254459. The next prime is 1661254537. The reversal of 1661254536 is 6354521661.

It is a junction number, because it is equal to n+sod(n) for n = 1661254494 and 1661254503.

It is not an unprimeable number, because it can be changed into a prime (1661254537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1115691 + ... + 1117178.

It is an arithmetic number, because the mean of its divisors is an integer number (133972200).

Almost surely, 2^1661254536 is an apocalyptic number.

It is an amenable number.

1661254536 is an abundant number, since it is smaller than the sum of its proper divisors (2625855864).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1661254536 is a wasteful number, since it uses less digits than its factorization.

1661254536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2232909 (or 2232905 counting only the distinct ones).

The product of its digits is 129600, while the sum is 39.

The square root of 1661254536 is about 40758.4903547715. The cubic root of 1661254536 is about 1184.3463517561.

The spelling of 1661254536 in words is "one billion, six hundred sixty-one million, two hundred fifty-four thousand, five hundred thirty-six".