1661051607 has 8 divisors (see below), whose sum is σ = 2225865600. Its totient is φ = 1101802680.

The previous prime is 1661051537. The next prime is 1661051621. The reversal of 1661051607 is 7061501661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1661051607 - 2¹⁵ = 1661018839 is a prime.

It is a super-2 number, since 2×1661051607² = 5518184882234564898, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661051677) 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, 1390569 + ... + 1391762.

It is an arithmetic number, because the mean of its divisors is an integer number (278233200).

Almost surely, 2^1661051607 is an apocalyptic number.

1661051607 is a deficient number, since it is larger than the sum of its proper divisors (564813993).

1661051607 is a wasteful number, since it uses less digits than its factorization.

1661051607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2782533.

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 1661051607 is about 40756.0008710374. Note that the first 3 decimals coincide. The cubic root of 1661051607 is about 1184.2981255507.

The spelling of 1661051607 in words is "one billion, six hundred sixty-one million, fifty-one thousand, six hundred seven".