1461662661640 has 32 divisors (see below), whose sum is σ = 3394829410560. Its totient is φ = 565804900800.

The previous prime is 1461662661637. The next prime is 1461662661647. The reversal of 1461662661640 is 461662661641.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1461662661647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 589378866 + ... + 589381345.

It is an arithmetic number, because the mean of its divisors is an integer number (106088419080).

Almost surely, 2^{1461662661640} is an apocalyptic number.

1461662661640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1461662661640 is an abundant number, since it is smaller than the sum of its proper divisors (1933166748920).

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

1461662661640 is a wasteful number, since it uses less digits than its factorization.

1461662661640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1178760253 (or 1178760249 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 49.

Subtracting from 1461662661640 its reverse (461662661641), we obtain a palindrome (999999999999).

The spelling of 1461662661640 in words is "one trillion, four hundred sixty-one billion, six hundred sixty-two million, six hundred sixty-one thousand, six hundred forty".