1661005022025 has 48 divisors (see below), whose sum is σ = 2795102173440. Its totient is φ = 870133286400.

The previous prime is 1661005021979. The next prime is 1661005022059. The reversal of 1661005022025 is 5202205001661.

It is not a de Polignac number, because 1661005022025 - 2¹⁶ = 1661004956489 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1661005021983 and 1661005022001.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3036949 + ... + 3541901.

It is an arithmetic number, because the mean of its divisors is an integer number (58231295280).

Almost surely, 2^{1661005022025} is an apocalyptic number.

1661005022025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1661005022025 is a deficient number, since it is larger than the sum of its proper divisors (1134097151415).

1661005022025 is a wasteful number, since it uses less digits than its factorization.

1661005022025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505746 (or 505741 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The spelling of 1661005022025 in words is "one trillion, six hundred sixty-one billion, five million, twenty-two thousand, twenty-five".