1661211614 has 4 divisors (see below), whose sum is σ = 2491817424. Its totient is φ = 830605806.

The previous prime is 1661211599. The next prime is 1661211619. The reversal of 1661211614 is 4161121661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4161121661 = 31 ⋅134229731.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661211619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415302902 + ... + 415302905.

It is an arithmetic number, because the mean of its divisors is an integer number (622954356).

Almost surely, 2^1661211614 is an apocalyptic number.

1661211614 is a deficient number, since it is larger than the sum of its proper divisors (830605810).

1661211614 is an equidigital number, since it uses as much as digits as its factorization.

1661211614 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830605809.

The product of its digits is 1728, while the sum is 29.

The square root of 1661211614 is about 40757.9638107695. The cubic root of 1661211614 is about 1184.3361516431.

The spelling of 1661211614 in words is "one billion, six hundred sixty-one million, two hundred eleven thousand, six hundred fourteen".