1661252044354 has 12 divisors (see below), whose sum is σ = 2898715302054. Its totient is φ = 711965161824.

The previous prime is 1661252044303. The next prime is 1661252044363. The reversal of 1661252044354 is 4534402521661.

It can be written as a sum of positive squares in only one way, i.e., 1660044134329 + 1207910025 = 1288427^2 + 34755^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1661252044354.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8475775639 + ... + 8475775834.

Almost surely, 2^{1661252044354} is an apocalyptic number.

1661252044354 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1661252044354 is a deficient number, since it is larger than the sum of its proper divisors (1237463257700).

1661252044354 is a wasteful number, since it uses less digits than its factorization.

1661252044354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16951551489 (or 16951551482 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 43.

The spelling of 1661252044354 in words is "one trillion, six hundred sixty-one billion, two hundred fifty-two million, forty-four thousand, three hundred fifty-four".