1650691540 has 48 divisors (see below), whose sum is σ = 3494872080. Its totient is φ = 654888960.

The previous prime is 1650691487. The next prime is 1650691541. The reversal of 1650691540 is 451960561.

It can be written as a sum of positive squares in 8 ways, for example, as 54848836 + 1595842704 = 7406^2 + 39948^2 .

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1650691540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1650691541) 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, 1616230 + ... + 1617250.

It is an arithmetic number, because the mean of its divisors is an integer number (72809835).

Almost surely, 2^1650691540 is an apocalyptic number.

1650691540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1650691540 is an abundant number, since it is smaller than the sum of its proper divisors (1844180540).

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

1650691540 is a wasteful number, since it uses less digits than its factorization.

1650691540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1612 (or 1610 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 1650691540 is about 40628.7034004286. The cubic root of 1650691540 is about 1181.8308120831.

The spelling of 1650691540 in words is "one billion, six hundred fifty million, six hundred ninety-one thousand, five hundred forty".